Clubjazz - Honda Jazz & HR-V Forums

Honda Jazz, HR-V & Hybrid Forums => Honda Jazz Mk2 2008-2015 => Topic started by: Steve2011 on October 22, 2015, 09:17:05 PM

Title: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on October 22, 2015, 09:17:05 PM
I wanted to start a thread about MPG as I think it's really interesting reading the variations for the Honda Jazz. I think one of the reasons of buying a small car is MPG for some people that is not all?  At moment I'm get a real variation of 38 around London 58 to 60 on Motorway to me that's excellent for a semi automatic i-Shift gearbox.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ozzie on October 22, 2015, 09:30:02 PM
2009 i-shift gets regular 44mpg, I think the mpg gauge is stuck !

2011 Hybrid varies from 48-52mpg on driving lessons, but I refuelled before driving 60 miles home today, and saw the range go up to 500 miles, so as I flicked to the mpg, it was up at 66mpg, not bad after 176,000 miles.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on October 22, 2015, 09:38:24 PM
2009 i-shift gets regular 44mpg, I think the mpg gauge is stuck !

2011 Hybrid varies from 48-52mpg on driving lessons, but I refuelled before driving 60 miles home today, and saw the range go up to 500 miles, so as I flicked to the mpg, it was up at 66mpg, not bad after 176,000 miles.

Galactic miles on that brilliant MPG, thought it might be higher for a Hybrid?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Downsizer on October 24, 2015, 10:18:11 AM
Based on 63000 miles of mixed motoring and actual fuel purchased over 7 years, I have consistently averaged 48 mpg in a Mk 2 1.4 manual.  I generally stick to speed limits!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: ck201ga on October 24, 2015, 10:25:29 AM
I am averaging 52MPG on every whole tank during the school runs/shopping etc. The best stats I have managed is 58MPG on an 18mile town & b road journey, 61.8 MPG on a 70mile motorway journey.

2013 1.4 Si
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on October 24, 2015, 11:02:29 AM
Can people confirm whether their MPG is based on miles and fuel used or what the car's computer says? The latter is invariably optimistic (between 5% to 10% in my experience). Based on my records of miles and fuel, I can report:

Mk 2 ES manual : Average 51.7 MPG (48.6 to 55.5 MPG)
Hybrid Jazz HS : Average 58.8 MPG (range 51.9 to 71.2 MPG)
Mk 3 SE CVT : Average 57.7MPG so far (1500 miles)

My motoring predominantly comprises journeys long enough to warm the engine up properly with winter and town driving minimised.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ocky on October 24, 2015, 12:17:34 PM
Current car - 2009 Jazz 1.4 EX 43mpg
Previous car - 2007 Honda Civic Hybrid 45mpg
Mixed driving
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: auntyneddy on October 24, 2015, 01:03:27 PM
I merely noted the speedo reading when filled up and then at my next fill, divided fuel by distance and got 44mpg.  That is very mixed driving, in a country area but also includes a fortnightly thrash down the A30 approximately 105 miles round trip depending which route I take.
The sad thing is now HM government has allowed HGV's to travel at higher speed it means often in order to overtake, 80mph is the order of the day. Before the purists tell me what a naughty boy I am, I object to sitting behind a gurt big 44 tonner chucking back stones, mud and those lovely carcinogenic fumes. That's without the latest trick of one trying to pass another with exactly the same top speed. Two trips back one of these luvlies took over 2 miles to pass the other. You can imagine the tail back that caused.
Where was plod? probably drinking tea somewhere.
 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on October 24, 2015, 02:26:09 PM
I get just a tad under 41 mpg. This is based on brim to brim and not the computer and over the last 20 months. I use fuelly.com and divide my type of motoring up into City and Highway but using Urban for City and Extra Urban for highway. My motoring divvies up as 65% Urban and 35% Extra Urban.

The highest mpg yet achieved is just under 49 mpg and that included about 90% extra urban. As for the claimed combined - never got closer than that.

I am a reasonably careful driver avoiding harsh acceleration and braking.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: bill ericay on October 24, 2015, 02:28:14 PM
My Jazz 1.4es nearly 3 years old and 16k miles on the clock- average mpg from new is 54.8 on the computer. I did once do it the proper way by topping up tank and checking how many litres needed/miles travelled at next fill up, and it roughly corresponded to what the computer said, so I decided to get a life and use the computer. Even if the computer is optimistic as several members have said ,its not a bad fuel consumption for all my driving since new- a 10% optimistic computer still shows nearly 50 mpg, that's good enough for me. I try to avoid short journeys ( by using a bike), don't commute, and tend to stick to any speed limits. Driving to Portsmouth on mainly dual carriageways, about 110 miles can show up to 60mpg on that there computer, depending on how many road works with 50mph limits I have to drive through. 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on October 24, 2015, 03:02:06 PM
Keep them coming guys I love seeing MPG obsessed, clinical stuff ;D.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on October 24, 2015, 03:33:05 PM
and it roughly corresponded to what the computer said, so I decided to get a life and use the computer.

I found that the smoother your driving the nearer the computer is to real mpg.  Computer uses injector open times to calculate MPG and takes a snapshot every so many seconds to come up with average readout (the mpg readout responds to changes in driving much more quickly after you zero the trip display because it is averaging fuel used over a small number of miles,  as the mileage on the trip increase the updating gets more and more sluggish, until after 100 miles mpg average readout barely changes at all whether you floor the throttle or drive carefully).

http://www.greencarreports.com/news/1090929_gas-mileage-displays-in-cars-accurate-or-optimistic (http://www.greencarreports.com/news/1090929_gas-mileage-displays-in-cars-accurate-or-optimistic)

That's definitely a Honda IMA dash in the above clip,  looks a lot like the Civic one with floating display and MPH reading just under the windscreen lower edge.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on October 24, 2015, 04:57:49 PM
I guess the other way is to just use the computer and knock 10% off that. In my case it is usually about 10% out.

I'm too OCD to do that though!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ocky on October 24, 2015, 07:00:18 PM
I'd agree that trip computer is about 10% optimistic.

Economy tends to reduce in the winter, not sure if it's due to electrics such as lights and heater rear window?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on October 24, 2015, 07:07:34 PM
Probably the biggest user of fuel in the winter is the colder temperatures and therefore longer warm up times when the engine runs richer for longer.

Vic.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: applicationcen on October 24, 2015, 07:14:16 PM
I think that humidity affects MPG more than temperature - Ill have a research into that.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Geoffers on October 24, 2015, 08:48:28 PM
My 2011 GE EX manual returned 46.2 mpg over 38k miles.  ;D
The 2009 GE ES manual returned 47.6 over 27k miles.  ;D

My current 2015 GE ES+ is returning 43.7 over 5k miles.  :(

All figures are real world, not from the car's computer!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on October 24, 2015, 09:27:41 PM
I think that humidity affects MPG more than temperature - Ill have a research into that.

Warm temperature and moist air are best for good MPG.

Warm air can hold more moisture than colder air,  that's why when temperature drops in the evening dew (or frost) forms on your car,  when the temperature has been below freezing for a few days in winter no more frost appears on your car because air has lost all its moisture.   Normally in UK as the temperature rises in summer the humidity goes up as well, while in winter the air is drier.   So its a triple whammy in UK winter,  colder air means car takes longer to warm up, the air is drier as well , and cold air is more dense than warm air so wind resistance increases as well.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: edam on October 24, 2015, 10:58:21 PM
No mention has been made about the petrol being used.
I use Tesco Momentum and I get 3-4 more mpg over normal petrol.
Using this petrol I notice that the engine revs lower for a speed. Obviously this could not happen on a manual gearbox but on a CVT??
I can go over 40mph with the engine revving at 1500rpm
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on October 25, 2015, 06:11:10 AM
No mention has been made about the petrol being used.
I use Tesco Momentum and I get 3-4 more mpg over normal petrol.
Using this petrol I notice that the engine revs lower for a speed. Obviously this could not happen on a manual gearbox but on a CVT??
I can go over 40mph with the engine revving at 1500rpm

There are plenty of discussions on this forum (arguments even) about benefits of higher octane fuel in the Jazz - I get about 10% better MPG using 97RON  fuel (and car feels much livelier)  - ------- handbook states 95 RON is 'minimum' octane for Jazz because of high compression ratio, anti-knock sensors on engine will retard ignition timing and lower engine power output for lower octane fuel but by putting 97 or 99 in the tank you allow timing to be advanced (done automatically by the ECU) and get more power - this allows lower throttle settings to be used in any given driving situation,  with a CVT this could well mean lower RPM for a given road speed.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on October 25, 2015, 11:28:38 AM
No mention has been made about the petrol being used.
I use Tesco Momentum and I get 3-4 more mpg over normal petrol.
Using this petrol I notice that the engine revs lower for a speed. Obviously this could not happen on a manual gearbox but on a CVT??
I can go over 40mph with the engine revving at 1500rpm

There are plenty of discussions on this forum (arguments even) about benefits of higher octane fuel in the Jazz - I get about 10% better MPG using 97RON  fuel (and car feels much livelier)  - ------- handbook states 95 RON is 'minimum' octane for Jazz because of high compression ratio, anti-knock sensors on engine will retard ignition timing and lower engine power output for lower octane fuel but by putting 97 or 99 in the tank you allow timing to be advanced (done automatically by the ECU) and get more power - this allows lower throttle settings to be used in any given driving situation,  with a CVT this could well mean lower RPM for a given road speed.

Interesting post and I'm glad you emphasised the wording on the filler cap and in the handbook. It says 95 RON "or higher" and I think that is significant. It infers, to me anyway, that the car will potentially benefit from a higher RON via the knock sensor.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: edam on October 25, 2015, 12:22:41 PM
I wonder what effect higher octane fuel will have on the MK3 1.3
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on October 25, 2015, 03:15:47 PM
I wonder what effect higher octane fuel will have on the MK3 1.3

I believe that the IVtec engines in the Mk2 and Mk3 are basically the same design so I would guess that any performance differences from using super unleaded would be about the same, if there are any.

I used Tesco Momentum for a long time while Tesco's special offers were on but as they have now finished I mostly use BP standard petrol. I am 5p/litre better off straightaway and my fuel consumption is the same as using the Tesco Momentum and as for other advantages I cannot detect any significant ones.
My average fuel consumption works out at 49mpg based on actual use not the on board device.
However use what you think works for you.

Vic.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Eddie Honda on October 25, 2015, 03:47:02 PM
Keep them coming guys I love seeing MPG obsessed, clinical stuff ;D.
No mention has been made about the petrol being used.

<<<< Just click on the figure to the left below my avatar and it'll tell you ;)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on October 25, 2015, 09:54:36 PM


I used Tesco Momentum for a long time while Tesco's special offers were on but as they have now finished I mostly use BP standard petrol. I am 5p/litre better off straightaway and my fuel consumption is the same as using the Tesco Momentum and as for other advantages I cannot detect any significant ones.
My average fuel consumption works out at 49mpg based on actual use not the on board device.
However use what you think works for you.

Vic.

Pretty much what I was doing. It might be the placebo effect but I felt the car had a slight edge using the higher octane stuff.

Having said all that, you won't do any harm using "cooking" petrol. It's what I used for years before the internet!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Defender on October 29, 2015, 05:39:44 PM
I get between high 30's (38, 39) when running around locally and low 50's (51, 52) on longer runs.
My commute to/from work is upper 40's (47, 48) which is a mixture of country lanes, a bit of town work, dual carriageway and M-way.
My current overall average is about 45.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: stiggysawdust on October 29, 2015, 07:29:56 PM
My overall average for the last 12 months is 44.6mpg. Mixed driving.
In the previous year with the same type of driving but with addition of 15 round trips of 120 motorway miles and the average was 48.5 mpg
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: stupot0041 on October 29, 2015, 08:16:42 PM
Getting low 50's measured brim to brim using 98 RON. Mostly motorway and A roads with a very steep hill up to my village (500m above sea level so winter tyres going on this weekend!).
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on October 29, 2015, 10:35:40 PM
It does feel a bit more lively with 98 Shell V-Power, but maybe it's a placebo effect? I can't make my mind up on it?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: braingoing on November 09, 2015, 10:10:12 PM
Hi, we have a 2012 jazz 1.4 EX CVT.
 Live in Essex and running around we get about 40 - 45 mpg, its on the open road that it's great, we go from home (near southend on Sea) to Croydon Surrey 80m round trip a lot , via A127, M25 etc. and we get a minimum of 55 mpg. I drive to the legal limits and do not put my foot down for no reason. I must add that I'm  a Advanced Motorist and a retired personal driver to a Family for a long time.
 My dearest won't see this, I hope, when she uses the car the mpg drops to about 35mpg as she drives it in Sport mode and she has racing colours on her shopping bags.
 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on November 26, 2015, 02:09:35 PM
My MPG has dropped dramatically lucky to get 28MPG at the moment also using Shell Nitro very strange. I don't hang around though like to push on as I'm always stuck in traffic due London rollix :P
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on November 26, 2015, 06:22:33 PM
It does feel a bit more lively with 98 Shell V-Power, but maybe it's a placebo effect? I can't make my mind up on it?

My trials (over 3 years  -on and off) with Shell V Power showed zero difference in mpg or driveability.. (I record all fuel and miles - manual and Fuelly)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ibhayirob on December 06, 2015, 09:07:49 PM
Quote  carsyguide

With the 1.5-litre engine Honda claimed an average consumption of 5.6 L/100 km for the manual and 5.5 L/100 km for the CVT. 



Hi there from Africa

Iv searched the fuel consumption posts and another forum  and I'm more confused than ever

I loved my 2005 1. 4 jazz for ten years of mostly city driving with no problems except a battery and a fuel pump

I never bothered about calculating fuel efficiency cause I knew she was light

Now I've upgraded to a twenty ten 1.5 ex auto and the computer economy Guage is confusing me

She seems heavier on petrol and the Guage never shows better than 8 L per hundred Or thirty five mpg I think  around town

Yet reading your posts I see talk of fifty plus mpg in town driving

Is that really possible  and realistically what can I expect around town with a light foot

I'd hate to think I have the one heavy on fuel jazz

Thanks

Rob
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on December 07, 2015, 09:32:30 AM
Quote  carsyguide

With the 1.5-litre engine Honda claimed an average consumption of 5.6 L/100 km for the manual and 5.5 L/100 km for the CVT. 



Hi there from Africa

Iv searched the fuel consumption posts and another forum  and I'm more confused than ever

I loved my 2005 1. 4 jazz for ten years of mostly city driving with no problems except a battery and a fuel pump

I never bothered about calculating fuel efficiency cause I knew she was light

Now I've upgraded to a twenty ten 1.5 ex auto and the computer economy Guage is confusing me

She seems heavier on petrol and the Guage never shows better than 8 L per hundred Or thirty five mpg I think  around town

Yet reading your posts I see talk of fifty plus mpg in town driving

Is that really possible  and realistically what can I expect around town with a light foot

I'd hate to think I have the one heavy on fuel jazz

Thanks

Rob

 I would be very lucky at this time of year in London driving if I get 32MPG at the moment according to my onboard computer screen  :-\
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ibhayirob on December 07, 2015, 07:16:02 PM


Hi
That's what my computer is telling me

Maybe the CVT box is more economical

My box says Park reverse neutral drive  d1 2 and3
Is this the I shift

I've only heard of the I  shift and the CVT

Now I'm wondering what sort of automat box I got

Any ideas

Rob
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on December 08, 2015, 09:59:21 AM


Hi
That's what my computer is telling me

Maybe the CVT box is more economical

My box says Park reverse neutral drive  d1 2 and3
Is this the I shift

I've only heard of the I  shift and the CVT

Now I'm wondering what sort of automat box I got

Any ideas

Rob

It should say iShift on you're gear lever , but I would say there's every little in it between the both gearbox's Tbf?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: richardfrost on December 08, 2015, 10:33:57 AM
It does feel a bit more lively with 98 Shell V-Power, but maybe it's a placebo effect? I can't make my mind up on it?

My trials (over 3 years  -on and off) with Shell V Power showed zero difference in mpg or driveability.. (I record all fuel and miles - manual and Fuelly)

My totally unscientific experience with Shell V Power (2013 Jazz 1.4EX) has been zero noticeable difference in fuel consumption, significant difference in wallet consumption, placebo difference maybe in engine cleaning effect, but TOTALLY DIFFERENT in terms of power and acceleration. It's very hilly round here and I sure can tell when I am running on the V-Power fuel when I put my foot down. I used to treat the Jazz to a full tank of it every third fill up, with the intention of giving the engine a bit of a clean.

I have traded the Jazz now for a diesel H-RV and have not yet used the uprated diesel for that. However, my son still runs our 2005 1.4 Jazz, and, since I pay his fuel bills, I encourage him to put V-Power in every third tank.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on December 08, 2015, 10:51:37 AM
It does feel a bit more lively with 98 Shell V-Power, but maybe it's a placebo effect? I can't make my mind up on it?

My trials (over 3 years  -on and off) with Shell V Power showed zero difference in mpg or driveability.. (I record all fuel and miles - manual and Fuelly)

My totally unscientific experience with Shell V Power (2013 Jazz 1.4EX) has been zero noticeable difference in fuel consumption, significant difference in wallet consumption, placebo difference maybe in engine cleaning effect, but TOTALLY DIFFERENT in terms of power and acceleration. It's very hilly round here and I sure can tell when I am running on the V-Power fuel when I put my foot down. I used to treat the Jazz to a full tank of it every third fill up, with the intention of giving the engine a bit of a clean.

I have traded the Jazz now for a diesel H-RV and have not yet used the uprated diesel for that. However, my son still runs our 2005 1.4 Jazz, and, since I pay his fuel bills, I encourage him to put V-Power in every third tank.

There was a very noticeable difference in 'driveability' with my Jazzes and possibly even more with my Civic by using higher octane fuel,  Honda engines have knock sensors and a good ECU capable of adjusting ignition and injectors to make full use of better fuel.  If you can resist temptation to use extra performance you can get more MPG  with cleaner pickup and no pinking on hills ( I have tried it many times),  but if you use the extra performance you probably won't get better MPG.   Older cars or cars with more  basic ECU may not respond well to higher octane fuel,  I know my motorbike ( carburettor and no ECU ) actually seems to run worse with higher octane.

Comparisons between MPG achieved are meaningless unless under pretty constant driving conditions as far as traffic, hills and road speeds are concerned,  its a bit like comparing apples and oranges.   I used to do exactly the same 80 mile return commute 5 days a week at same times in same traffic, winter and summer and could easily see the difference in MPG I was getting between basic 95 and higher octane fuels (even between different brands of same octane fuel) obviously more in warmer weather anyway no matter what fuel you use, also tried supermarket fuel sometimes when desperate to fill up and noted that car didn't run as well. 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: richardfrost on December 09, 2015, 03:10:56 AM
but if you use the extra performance you probably won't get better MPG

He he. That is me! I would agree 100%.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: LJs JAZZ on December 10, 2015, 11:13:39 AM
 I have a 2012 CVT  Jazz, I keep a record of all fuel purchased since new. The car has now done 37000 miles and MPG is 41, I do mostly shorter journeys and give it a good longer run at weekends usually. I have done a few checks on MPG at various times, after a good long motorway round trip of 500 miles it returned 55MPG. The worst figures were in the first year when the engine was running in, that was 36 MPG. I have been running it on supermarket super unleaded  for the last 2 years, and noticed a slight improvement in performance, but not MPG, but as the supermarket super unleaded is the same price as the regular unleaded at other stations it seems worth it to me. The on-board computer is very optimistic and I take little notice of it in regard to MPG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: plasma on December 18, 2015, 03:25:38 PM
I merely noted the speedo reading when filled up and then at my next fill, divided fuel by distance and got 44mpg.  That is very mixed driving, in a country area but also includes a fortnightly thrash down the A30 approximately 105 miles round trip depending which route I take.
The sad thing is now HM government has allowed HGV's to travel at higher speed it means often in order to overtake, 80mph is the order of the day. Before the purists tell me what a naughty boy I am, I object to sitting behind a gurt big 44 tonner chucking back stones, mud and those lovely carcinogenic fumes. That's without the latest trick of one trying to pass another with exactly the same top speed. Two trips back one of these luvlies took over 2 miles to pass the other. You can imagine the tail back that caused.
Where was plod? probably drinking tea somewhere.

Good post,
Plasma.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ibhayirob on January 11, 2016, 04:28:35 PM


Ok

Finally I filled the tank and done two or three  free way trips

The rest around town

Km devided by litres gave me eight litres per hundred which I think is thirty five mpg

Nothing to write home about

And the computer readout varies all the time
What's the correct way to use it

when it says seven litres per hundred is it referring to the consumption at that instant or since you last reset the km Guage or since you first bought the car

Or since you last started the car

Finally the vtec engine

Has anyone seen a good post on how best to use it

I read it only kicks in at five thou which I never see with my automatic

What's the point of having it

Still in love though

Rob
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on January 12, 2016, 04:00:17 PM
On the point of the i vetch I remember reading, when I had my Civic, that it can be set up in different ways in the factory and in most cars it's set up for lower down torque and economy but in performance cars like the Type R it is set up for performance and the power really kicks in at 5,000.

Don't ask me about the technicalities though!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: bill ericay on January 12, 2016, 04:35:34 PM
For the benefit of newer forum members, here is a link to all about the VTEC  http://asia.vtec.net/Series/FitJazz/lseries/ (http://asia.vtec.net/Series/FitJazz/lseries/)
Enjoy !
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Rambler on January 17, 2016, 07:54:25 PM
Well I'm trying to get my mpg above 50.

But the computer thingy currently reads 43.4 , it did read 44 last weekend.

Driving very carefully, upshifting with the dash light , accelerating slowly.

Used to have a heavy right foot. :D

Was hoping to get 50 mpg , to be honest I'm getting almost the same weekly fuel costs as my old 52reg D4D Rav4 with 145'000 on the clock.

Been putting in £20 a week,  so not as economical as I thought it would be.

Its a well designed,  light,  spacious,  modern, reliable and comfortable car....but I thought it would be much cheaper to run fuel wise.

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on January 18, 2016, 11:55:48 AM
I think some people might get 50 but if you go on Fuelly.com and look at other Jazzes you won't find many average more than the low 40s. Some much lower than that.

I've never got 50 even on a long run.

It's not an especially economical car but, as a package, it suits me.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Rambler on January 18, 2016, 03:16:39 PM
I think some people might get 50 but if you go on Fuelly.com and look at other Jazzes you won't find many average more than the low 40s. Some much lower than that.

I've never got 50 even on a long run.

It's not an especially economical car but, as a package, it suits me.

Yep,  realising that now.

I think 45mpg may be optimistic for me.

As you say , as a package its good at what it does.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: bill ericay on January 18, 2016, 03:30:42 PM
As my previous post, now done 17000 from new at an average of 54.3 mpg for those 17000 miles. Last 1200 miles average 53.3. It can be done !
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on January 18, 2016, 05:24:09 PM
Is yours a CVT bill? They do do a bit more mpg according to the figures. Also, are you using the computer or brim to brim to measure?

And what's your secret? I must admit I am reasonably happy with just over 40 because I do so much stop start stuff but the most I've got on a long journey is 48.9 and I wasn't caning it.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on January 18, 2016, 06:38:24 PM
Yep,  realising that now.

I think 45mpg may be optimistic for me.

As you say , as a package its good at what it does.
Winter is not a good time of year to get good fuel consumption. Apart from the basic problem of the engine taking time to warm up (I always wonder why car manufacturers don't provide thermostatically controlled louvres on the air inlet to the engine compartment), cold air has higher viscosity (= more drag), it's often windy (and tail winds don't compensate for head winds) plus there is usually more demand from the electrics.

A couple of my fuel saving tips would be (a) keep the revs below about 2,000 unless needing the power and (b) drive as if the brakes didn't work and try to anticipate needing to use them by easing off the accelerator a bit sooner.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: bill ericay on January 18, 2016, 07:12:17 PM
Quote
A couple of my fuel saving tips would be (a) keep the revs below about 2,000 unless needing the power and (b) drive as if the brakes didn't work and try to anticipate needing to use them by easing off the accelerator a bit sooner

As above + drive at 60-70 instead of 70-80mph, although I do that because I'm paranoid that mine will be the first Jazz caught speeding at 75 mph !

When I first got the car , which is manual by the way, I used the brim to brim (oo-er missus!) method once, found it was roughly what the computer said, and got a life and trusted the computer. If it's 5-10 % optimistic I'm still happy with my fuel consumption.

Oh, and the other trick is to tape a raw egg to my accelerator pedal and try and finish the journey without breaking it . ;) 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: bill ericay on January 18, 2016, 07:17:25 PM
I forgot (being an old duffer), my best fuel consumption was Billericay to Portsmouth , about 120 miles, mainly motorway, when there was about 10 miles of 50 limit due to roadworks, by the time I got to Portsmouth the computer said 59.9 mpg. for the journey. I can live with that.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on January 19, 2016, 12:56:26 PM
Good stuff bill. Even if you knock 10% of for computer error you are near 50 mpg overall.

I've got a period coming up when I'll be doing 70 miles a day, mostly motorway, for 4 weeks. I shall be watching the mpg closely to see if I can crash though the 50 mpg barrier if only once.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: charliecoco on January 19, 2016, 01:40:09 PM
Hi everybody, I make a 60 mile round trip to my mums each week, I set off with a full to brim tank, refill when I
get back, it takes a fiver which is about 5 litres, 1 gallon is 5.1 litres so that's about 60 mpg (mixed driving conditions)
 :D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on January 19, 2016, 01:46:46 PM
Charlie, you may like to revise your calculations,I believe one gallon is 4.54 litres which, I think, works out at 55mpg.
Still very good though.

Vic.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on January 19, 2016, 01:53:26 PM
All my Jazz's fuel computers have been optimistic by about 2mpg so roughly 4%.
That's close enough as far as I am concerned for day to day comparisons.
My Mk 1 CVT's returned about 48mpg on average, my Mk 2 manual about the same.My current car is a Mk2 facelift CVT 2011 model that is returning about 50mpg but the CVT's have always had higher overall gearing than the manuals.

Vic.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: charliecoco on January 19, 2016, 02:07:30 PM
yeah,5litres 1.1 gallons, still happy with mpg though as the bmw only did 18/22 mpg :o
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: jazzway on January 19, 2016, 02:26:36 PM
I had to use an online conversion tool as i only know liter/100 kilometer. ;)
Our Jazz computer 'says' 6/100 what is 47mpg. Now it is cold when i step in the car and i use climate control plus extra blowing front window and back window/mirrors until it's warm and clean. Before the cold it was 5.8/100, which is 49mpg.
Mostly short town driving and the numbers are without correction to real usage -- it is just what computer shows me. ;)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Kenneve on January 19, 2016, 05:36:28 PM
Hi Guys

My 2013 Ex CVT has now covered 19662 miles and the main trip is showing 45.9 mpg.
However the 'A' trip is showing 7552 miles and is showing the same mpg, so I must have reset the trip at some point, so not really sure which mileage the result relates to
The best recorded result so far has been 57.7 mpg over a 240 mile return motorway run, from Solihull to North Lincolnshire, driving at around 60-65 mph.  This is a fairly regular trip and I can usually repeat the result, within perhaps 1 or 2 mpg. All results from the trip computer.

Best regards to all.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: AndyNo1 on January 24, 2016, 07:05:38 PM
We have a 14 plate CVT. Managed to get 66.2 mpg (computer) on a 40 mile run (Croydon to Hornchurch).
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on January 25, 2016, 11:11:49 PM
We have a 14 plate CVT. Managed to get 66.2 mpg (computer) on a 40 mile run (Croydon to Hornchurch).

You must be driving like an angel  ;D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: AndyNo1 on January 27, 2016, 05:40:14 PM
Did it again and got bang on 68mpg.

I wouldn't say angel. Probably annoyed a lot people doing it lol
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on January 29, 2016, 08:15:11 AM
We have a 14 plate CVT. Managed to get 66.2 mpg (computer) on a 40 mile run (Croydon to Hornchurch).

You must be driving like an angel  ;D
Or a helpful tail wind.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: AndyNo1 on January 31, 2016, 07:51:05 PM
Cruise control, a light right foot and forward thinking  ;)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: ian_5135 on January 31, 2016, 10:36:43 PM
i get 40-42mpg at high speeds on motorways. But on long runs of 70mph cruise control, i get 48mpg. the speedo shows as 55mpg-65mpg, but its a bit of a lie after i check from the petrol stations.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on February 01, 2016, 03:54:03 PM
A lot depends on roads , traffic and weather.

On long motorway runs: around 53mpg (cruise at 70mph).
Urban winter 42
Urban summer 44
Going along country lanes to and from local beekeeping apiary - LOTs of hills and single track roads with passing places and top speed of 30mph - around 35mpg  (or less if there are lots of horses)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on February 13, 2016, 09:24:07 PM
A lot depends on roads , traffic and weather.

On long motorway runs: around 53mpg (cruise at 70mph).
Urban winter 42
Urban summer 44
Going along country lanes to and from local beekeeping apiary - LOTs of hills and single track roads with passing places and top speed of 30mph - around 35mpg  (or less if there are lots of horses)

If you have any wild honey for sale ? Ill have some off you  ;)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sitefive on February 13, 2016, 11:25:09 PM
Well I'm trying to get my mpg above 50.

But the computer thingy currently reads 43.4 , it did read 44 last weekend.

Driving very carefully, upshifting with the dash light , accelerating slowly.

Used to have a heavy right foot. :D

Was hoping to get 50 mpg , to be honest I'm getting almost the same weekly fuel costs as my old 52reg D4D Rav4 with 145'000 on the clock.

Been putting in £20 a week,  so not as economical as I thought it would be.

Its a well designed,  light,  spacious,  modern, reliable and comfortable car....but I thought it would be much cheaper to run fuel wise.

This is what I don't get about people who buy brand new cars just because they want more ''fuel efficient'' car. You will be saving maybe £10 a week on petrol but will loose at least £70 a week on deprecation , that's of course for a good value holding car such as jazz.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 14, 2016, 12:18:29 PM
Well I'm trying to get my mpg above 50.

But the computer thingy currently reads 43.4 , it did read 44 last weekend.

Driving very carefully, upshifting with the dash light , accelerating slowly.

Used to have a heavy right foot. :D

Was hoping to get 50 mpg , to be honest I'm getting almost the same weekly fuel costs as my old 52reg D4D Rav4 with 145'000 on the clock.

Been putting in £20 a week,  so not as economical as I thought it would be.

Its a well designed,  light,  spacious,  modern, reliable and comfortable car....but I thought it would be much cheaper to run fuel wise.

This is what I don't get about people who buy brand new cars just because they want more ''fuel efficient'' car. You will be saving maybe £10 a week on petrol but will loose at least £70 a week on deprecation , that's of course for a good value holding car such as jazz.

That a good point - unless you do a lot of miles fuel costs are only a small part of running costs, depreciation can cost you a lot more and the newer the car the steeper the depreciation.  If your car maker has managed to con the authorities into believing the car is ultra frugal and low emissions (VW / Audi for instance) you may get low VED and congestion charge exempt, which is a bonus.   People with electric cars are basically getting free / cheap fuel at the moment,  but wait till the honeymoon is over and government has managed to get enough people to invest in toy cars and see the costs rise because powers that be will slap a tax on electricity and maybe fit cars with GPS to monitor how many miles you did, and where those miles were and charge you for the pleasure of using the roads you already paid for many times over.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sitefive on February 14, 2016, 07:38:15 PM
Well I'm trying to get my mpg above 50.

But the computer thingy currently reads 43.4 , it did read 44 last weekend.

Driving very carefully, upshifting with the dash light , accelerating slowly.

Used to have a heavy right foot. :D

Was hoping to get 50 mpg , to be honest I'm getting almost the same weekly fuel costs as my old 52reg D4D Rav4 with 145'000 on the clock.

Been putting in £20 a week,  so not as economical as I thought it would be.

Its a well designed,  light,  spacious,  modern, reliable and comfortable car....but I thought it would be much cheaper to run fuel wise.

This is what I don't get about people who buy brand new cars just because they want more ''fuel efficient'' car. You will be saving maybe £10 a week on petrol but will loose at least £70 a week on deprecation , that's of course for a good value holding car such as jazz.

That a good point - unless you do a lot of miles fuel costs are only a small part of running costs, depreciation can cost you a lot more and the newer the car the steeper the depreciation.  If your car maker has managed to con the authorities into believing the car is ultra frugal and low emissions (VW / Audi for instance) you may get low VED and congestion charge exempt, which is a bonus.   People with electric cars are basically getting free / cheap fuel at the moment,  but wait till the honeymoon is over and government has managed to get enough people to invest in toy cars and see the costs rise because powers that be will slap a tax on electricity and maybe fit cars with GPS to monitor how many miles you did, and where those miles were and charge you for the pleasure of using the roads you already paid for many times over.

same thing for the road tax. are people really buying a brand new car and swapping form old one just because the commercial says you will now be paying no tax or maybe £20 tax when they were paying maybe £100 a year tax before? To buy a new car for usually at least £20,000 just to save extra £80 a year for the 4-5years they will be owning it is just insane...

I have nothing against people buying new cars, as that means people like me will be able to pick up their car for a fraction of a cost in a few years but to buy a brand new car just to get 10 more mpg and £100 a year savings on tax is just riddicilous
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: stesjazz on February 15, 2016, 03:16:00 PM
I Inherited my azure blue 2013 Jazz 1.4ex last year when my Dad passed away, and although its not my sort of car, its not a bad small hatch for shopping and days out etc...  :P the economy over winter on very short trips can be as low as 30mpg.and on a run high 40's.... but ive fitted a k&n panel filter,for improved air flow, and i use shell v-power nitro plus fuel,(dont laugh!) and today went on a gentle drive, (cruise control set at 58mph) and i got 58.8mpg! so if you drive like a vicar they can be economical! lol.its just coming upto 3 years old and has done only 6,000miles!! just wish it was faster  ;D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 15, 2016, 05:39:24 PM
just wish it was faster  ;D

You need to rev Honda engines,  its an 100BHP car so isn't too shady but you need to get to the 3500 / 4000 area before it gets on song.  And don't worry the engines are built to rev and you won't break the engine or wear it out any quicker by pushing the loud pedal a bit harder and changing up later,  it may surprise you,  but don't expect 58mpg though.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve2011 on February 15, 2016, 05:49:26 PM
just wish it was faster  ;D

You need to rev Honda engines,  its an 100BHP car so isn't too shady but you need to get to the 3500 / 4000 area before it gets on song.  And don't worry the engines are built to rev and you won't break the engine or wear it out any quicker by pushing the loud pedal a bit harder and changing up later,  it may surprise you,  but don't expect 58mpg though.

I get about 26MPG when I use the process ;D.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: stesjazz on February 15, 2016, 06:16:25 PM
oh i give it some revs sometimes, just looks a bit daft doing 65mph in 2nd gear in a honda jazz!! :P
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sitefive on February 17, 2016, 12:00:15 AM
oh i give it some revs sometimes, just looks a bit daft doing 65mph in 2nd gear in a honda jazz!! :P
wtf? 65mph in 2nd gear? you sure are aware that after it's peak point at 3.5-4k the performance drops even tho the revs increases? I do some ''drag races'' as well  , mainly with the busses, or a car I can see that is even slower than a jazz-not many cars like that exist tho...
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on February 17, 2016, 08:50:43 AM
wtf? 65mph in 2nd gear? you sure are aware that after it's peak point at 3.5-4k the performance drops even tho the revs increases? I do some ''drag races'' as well  , mainly with the busses, or a car I can see that is even slower than a jazz-not many cars like that exist tho...
Peak torque is likely to be around 5,000 rpm (see http://asia.vtec.net/Engines/LSERIESG2/index.html (http://asia.vtec.net/Engines/LSERIESG2/index.html)) but the power increases up to around 6,000 rpm.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: stesjazz on February 17, 2016, 04:25:12 PM
wtf? 65mph in 2nd gear? you sure are aware that after it's peak point at 3.5-4k the performance drops even tho the revs increases? I do some ''drag races'' as well  , mainly with the busses, or a car I can see that is even slower than a jazz-not many cars like that exist tho...
Peak torque is likely to be around 5,000 rpm (see http://asia.vtec.net/Engines/LSERIESG2/index.html (http://asia.vtec.net/Engines/LSERIESG2/index.html)) but the power increases up to around 6,000 rpm.
exactly john, peak bhp is at 6000rpm and peak torque around 4800rpm, the i-vetec basically closes one intake valve per cylinder,for economy then opens them up around 5000rpm plus for max performance on this engine.so its basically a 12v engine most of the time, then a 16v engine at the highest revs. to be fair my jazz now seems alot nippier after a 100mile run, so its definately done it good. i just wish it had shorter gear ratios so it would pull better, as nobody needs to do 65mph in 2nd gear!!, but it will!  :P my ford puma has an excellent close ratio box, and only does around 50mph in 2nd before change up is required, but it makes it very nippy indeed around town! ;-)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: harry22673 on February 17, 2016, 08:30:45 PM
I do some ''drag races'' as well  , mainly with the busses, or a car I can see that is even slower than a jazz-not many cars like that exist tho...
If its moving slower then you are faster
I've found that if I do come across anyone who wants to do that they always slow down so much for turns and roundabouts
Had an experience with some Audi guy
He thought I wanted to take him on because I over took him and didn't slow down for the roundabout
My reason was efficiency
His was just being an Audi guy
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Downsizer on February 18, 2016, 03:26:31 PM
I'm trading in my Oct 2008 MkII 1.4 manual which I've had from new for a new MkIII CVT.  Over the 7+ years, I've driven 65761 miles and bought 6280 litres of mainly supermarket 95 RON fuel.  This gives 10.47 miles/litre (5.97 litres/100 km) or 47.6 mpg.  This is mixed short run and long distance, but I try to stick to the 70 mph max limit.  According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on February 18, 2016, 04:32:18 PM
According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.
I think a fair target would be around 10% improvement. The auto idle stop will save a bit of fuel under stop-start driving, the Mk 3 has slightlly better aerodynamics which helps the open road mpg, plus there are tweaks to the engine and its management system.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: monkeydave on February 18, 2016, 04:44:53 PM
According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.
I think a fair target would be around 10% improvement. The auto idle stop will save a bit of fuel under stop-start driving, the Mk 3 has slightlly better aerodynamics which helps the open road mpg, plus there are tweaks to the engine and its management system.

did you get a good trade in value for the mk2?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Downsizer on February 18, 2016, 06:12:11 PM

did you get a good trade in value for the mk2?
£3000 plus £600 discount on the new car and some free mats.  I have also bought 5 years servicing for £555.  I could probably have done better selling privately, but life's too short at 73!  I had been offered £2500 by a VW dealer against a Golf!  The Jazz will do all I need.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on February 18, 2016, 09:49:07 PM
I'm trading in my Oct 2008 MkII 1.4 manual which I've had from new for a new MkIII CVT.  Over the 7+ years, I've driven 65761 miles and bought 6280 litres of mainly supermarket 95 RON fuel.  This gives 10.47 miles/litre (5.97 litres/100 km) or 47.6 mpg.  This is mixed short run and long distance, but I try to stick to the 70 mph max limit.  According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.

Hope you enjoy the new car.

Interesting little nugget in your post - 65761 miles on mainly supermarket 95 RON with no ill effects - this does counteract those who argue that it destroys cars - evidently it doesn't and 47.6 mpg overall isn't too shabby. I waver and wobble about fuel but you have given me faith to continue filling up at Sainsburys/Tesco.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Downsizer on February 19, 2016, 10:28:34 AM
Looking at my  7+ years consumption figures in more detail, I find that for the 4 years when we lived 4 miles out of town and also had a Yaris which was used mainly by my wife for local trips, the Jazz averaged 48.4 mpg.  We then moved into the centre of town and sold the Yaris, since when the average Jazz consumption has changed to 46.1 mpg.  I'm not suggesting for a moment that my wife has a heavier right foot, but simply that the journey mix has changed, with the Jazz doing more short runs since we moved.  This shows how difficult it is to do meaningful comparisons.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on February 19, 2016, 12:37:18 PM
Indeed. Looking at my former Jazz - the same model as I have now but the pre 2011 facelift version - the highest mpg was 48.9 and the lowest mpg 33 (based on brim to brim and entered in fuelly.com). I do the odd long journey and that co-incided with the best mpg - the worst mpg was recorded in December with virtually all local journeys.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 19, 2016, 01:38:41 PM
I'm trading in my Oct 2008 MkII 1.4 manual which I've had from new for a new MkIII CVT.  Over the 7+ years, I've driven 65761 miles and bought 6280 litres of mainly supermarket 95 RON fuel.  This gives 10.47 miles/litre (5.97 litres/100 km) or 47.6 mpg.  This is mixed short run and long distance, but I try to stick to the 70 mph max limit.  According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.

Hope you enjoy the new car.

Interesting little nugget in your post - 65761 miles on mainly supermarket 95 RON with no ill effects - this does counteract those who argue that it destroys cars - evidently it doesn't and 47.6 mpg overall isn't too shabby. I waver and wobble about fuel but you have given me faith to continue filling up at Sainsburys/Tesco.

nobody said that supermarket fuel destroys engines - just that engine runs better on 'branded fuels' -  I proved this because my wife used to buy only supermarket fuel and i started filling her car with branded fuel without her knowledge,  she actually asked me if I had 'tuned' her engine to make it run better - pretty much a blind trial with no 'placebo effect' as some on here claim.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 19, 2016, 01:45:29 PM
He thought I wanted to take him on because I over took him and didn't slow down for the roundabout
My reason was efficiency
His was just being an Audi guy

AUDI and BMW drivers are easily wound up - they have a Germanic mentality and lets face it other road users don't go out of their way to make their life easy,  mainly because most of them attract road rage like jam attracts wasps,  mainly down to their arrogant attitude which seems to be supplied with the car badge.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on February 19, 2016, 02:07:18 PM
I'm trading in my Oct 2008 MkII 1.4 manual which I've had from new for a new MkIII CVT.  Over the 7+ years, I've driven 65761 miles and bought 6280 litres of mainly supermarket 95 RON fuel.  This gives 10.47 miles/litre (5.97 litres/100 km) or 47.6 mpg.  This is mixed short run and long distance, but I try to stick to the 70 mph max limit.  According to the publicity, the MkIII will be somewhat more economical, but I shall be happy with the same again.

Hope you enjoy the new car.

Interesting little nugget in your post - 65761 miles on mainly supermarket 95 RON with no ill effects - this does counteract those who argue that it destroys cars - evidently it doesn't and 47.6 mpg overall isn't too shabby. I waver and wobble about fuel but you have given me faith to continue filling up at Sainsburys/Tesco.

nobody said that supermarket fuel destroys engines - just that engine runs better on 'branded fuels' -  I proved this because my wife used to buy only supermarket fuel and i started filling her car with branded fuel without her knowledge,  she actually asked me if I had 'tuned' her engine to make it run better - pretty much a blind trial with no 'placebo effect' as some on here claim.

Fair comment. I think there is a difference between your statement that you can get a measurable improvement in performance and/or economy from using higher octane fuels and others on the internet who talk about supermarket petrol being rubbish with no additives and being responsible for engine failure.

Interestingly, Greenergy, who supply Tesco with petrol and diesel have recently signed a deal to supply Esso with petrol so this indicates that the dividing line between branded and unbranded must be virtually non existent.

The key difference seems to be in a better additive package in the higher octane fuels.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: RichardA on February 19, 2016, 03:44:29 PM
He thought I wanted to take him on because I over took him and didn't slow down for the roundabout
My reason was efficiency
His was just being an Audi guy

AUDI and BMW drivers are easily wound up - they have a Germanic mentality and lets face it other road users don't go out of their way to make their life easy,  mainly because most of them attract road rage like jam attracts wasps,  mainly down to their arrogant attitude which seems to be supplied with the car badge.

+ Vauxhall Insignia. Had one on a dual carriageway (I'm sure it's the same guy - silver 63plate facelift model) litetally block an overtake and another occasion speed up whilst I tried to overtake.

Sent from my GT-S7500 using Tapatalk 2

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on February 19, 2016, 03:47:45 PM
From Peteo48

Quote
Interestingly, Greenergy, who supply Tesco with petrol and diesel have recently signed a deal to supply Esso with petrol so this indicates that the dividing line between branded and unbranded must be virtually non existent.
The key difference seems to be in a better additive package in the higher octane fuels.

Their website is worth a glance.

Vic.

http://www.greenergy.com/ (http://www.greenergy.com/)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 19, 2016, 04:28:14 PM
There was a major incident down south a few years ago where supermarket fuel contaminated with silica caused failures of oxygen Llambda sensors on many vehicles.

Base stock is pretty standard, the additive package is added to tanker as it leaves the depot, once the destination is known.  Ethanol reduces the energy density of petrol while increasing its octane rating.

I love the comment of a scientist comparing petrol with diesel,  he said petrol is a highly refined product and we know exactly what is in it and how it burns (fully) where diesel is not too much far removed from the oil that comes out of the ground and no-one is sure what is in it and how much,  and it burns and produces all kinds of nasty stuff - bio diesel actually produces more NOx than the stuff 'refined' from crude oil.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on February 19, 2016, 05:43:33 PM
From Peteo48

Quote
Interestingly, Greenergy, who supply Tesco with petrol and diesel have recently signed a deal to supply Esso with petrol so this indicates that the dividing line between branded and unbranded must be virtually non existent.
The key difference seems to be in a better additive package in the higher octane fuels.

Their website is worth a glance.

Vic.


http://www.greenergy.com/ (http://www.greenergy.com/)

Yes - I often look at it being a bit of a nerd. They do seem very transparent as a company. Not many of the other companies publish their fuel data sheets. What's also interesting are the slight changes in the chemical makeup of the fuel from batch to batch.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: VicW on February 20, 2016, 03:53:19 PM
I suggest that Greenergy supply fuel to various outlets such as Esso and Tesco made to whatever recipe a particular contract specifies.
In other words the 95 octane petrol supplied to Tesco isn't necessarily the same as that supplied to Esso etc so there is still the possibility that different fuels have different qualities.

Vic.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on February 20, 2016, 05:04:07 PM
Yes - that may be true as well! I assume the fuel data sheets relate to Tesco fuel but also fuel supplied to other forecourt outfits like NISA etc etc.

Somewhere there is a reference to supplying "Esso quality" fuels to Esso outlets. Unfortunately those data sheets aren't published as such so I found myself wondering if that meant they supplied quality fuel to Esso outlets or whether the fuel had specific Esso qualities.

Difficult to get any genuine information about these products. I can't, off hand, think of any other commodity where the consumer is kept largely in the dark about the "ingredients" so to speak except, perhaps, Coca Cola.

Informed choices not easy.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Pine on February 20, 2016, 07:31:11 PM
All the petrol refined in the UK is produced to meet British and European Standards BS EN 228 for 95 octane unleaded and BS EN 7800 for Spuer unleaded. Oil companies are not going to waste money refining crude oil to a higher spec than necessary so you can be sure the base petrol is much the same no matter where you buy it from. The difference between brands is with the additives added to the base petrol that help clean inlet valves and fuel injectors. Some brands also claim to have friction reducers. The additives are added to the fuel as the tankers are filled at the fuel depot and are added in very small amounts, parts per million. Although added in very small amounts the oil companies claim this is enough to make a difference and the major brands that have their own development teams seem to have the evidence to prove their claims. Smaller suppliers and independents use industry standard additives supplied by an international automotive chemical company.

Wherever you buy you fuel you are getting a product that is of a higher quality that any thing available in the past. Years ago once a car had covered 40000 miles the cylinder head would have to come off for decarbonation. With the advent of fuel injection and pressure from car manufacturers and emission legislation the oil companies have had to up their game.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: TG on February 21, 2016, 07:30:36 PM
I don't understand people who distrust supermarket fuel, it's not like own brand baked beans vs. Heinz.

My now retired father was with ExxonMobil Special Products division for 30 years, and was witness to the start of supermarket petrol.  Back when producers & refiners still owned distribution networks Esso won the contract to run the fuel side of Tesco filling stations, fuel companies only own a small proportion of the total filling stations; now most forecourts are run under brand licence and operators tend to have diverse portfolios of Esso, BP, Shell, Texaco etc. stations.

As the majors retreated from retailing & distribution to concentrate on production, wholesalers/distributors such as Greenergy have stepped in. As Pine says, the 'blend' is made one stage prior to tanker fill, the suppliers to the mix are determined more by price and availability than by company hierarchy. There is no direct link between the crude from a Exxon oil well to the fuel on an Esso forecourt.

Fuel additives vary more by season & region than by brand purely for climate.  The guys in QC at the labs will tell you there is more variation in tap water than in a basic rated fuel between suppliers.
--
TG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Beaver on February 21, 2016, 07:38:03 PM
Impressive from a 2012 model?

(https://farm2.staticflickr.com/1503/24808221809_1929c8c6a1_z.jpg)

Not really, unfortunately.   I reset my trip meters while on the move a couple of days ago and it immediately jumped to 119mpg.   By the time I could safely stop to take a photo it had dropped to this.   Normally I achieve the same MPG as many others...
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Rambler on February 22, 2016, 08:26:10 AM
Impressive from a 2012 model?

(https://farm2.staticflickr.com/1503/24808221809_1929c8c6a1_z.jpg)

Not really, unfortunately.   I reset my trip meters while on the move a couple of days ago and it immediately jumped to 119mpg.   By the time I could safely stop to take a photo it had dropped to this.   Normally I achieve the same MPG as many others...

Wow !!.. how on earth did you achieve this , cant get anymore than 44 out of mine.

Mines EX 1.4 2014 with 11k miles.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on February 22, 2016, 05:02:18 PM
Wow !!.. how on earth did you achieve this , cant get anymore than 44 out of mine.

Mines EX 1.4 2014 with 11k miles.
You can do better, temporarily. Go to the top of a long hill, build up some speed, reset the meter, cruise down to the bottom and check the mpg.

You will see that the distance for that mpg is only 0.5 miles.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: ColinS on February 22, 2016, 05:04:51 PM
Not really, unfortunately.   I reset my trip meters while on the move a couple of days ago and it immediately jumped to 119mpg.   By the time I could safely stop to take a photo it had dropped to this.   Normally I achieve the same MPG as many others...

I too was surprised until I read the post  :D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Rambler on February 24, 2016, 10:32:49 AM
Not really, unfortunately.   I reset my trip meters while on the move a couple of days ago and it immediately jumped to 119mpg.   By the time I could safely stop to take a photo it had dropped to this.   Normally I achieve the same MPG as many others...

I too was surprised until I read the post  :D

Lol....nice one. :P ;D had me for a while
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: richardfrost on February 26, 2016, 10:38:12 AM
I do some ''drag races'' as well  , mainly with the busses, or a car I can see that is even slower than a jazz-not many cars like that exist tho...
If its moving slower then you are faster
I've found that if I do come across anyone who wants to do that they always slow down so much for turns and roundabouts
Had an experience with some Audi guy
He thought I wanted to take him on because I over took him and didn't slow down for the roundabout
My reason was efficiency
His was just being an Audi guy

A couple of years back, I was heading South on the M1 and came off at Jn 21(?) to go down the M69 towards Coventry. The roundabout is traffic controlled and there was an Audi TT parked at the front of the queue in the middle lane but the outside lane was clear. I was decelerating from motorway speeds and didn't want to stop for the lights so I stayed in the outside lane behind a Mazda and by the time we reached the lights we were still doing 30mph and they changed, so basically, I got the jump on the TT and then on the roundabout, whilst indicating and knowing the way was clear, I moved over into the middle lane.

What I hadn't counted on was his indignation at being jumped at the lights by a Jazz, so he had roared away from the lights and was closing the gap I was moving into. Needless to say, I continued my manoeuvre and then we all had to stop again on the roundabout just before the exit to the M69. So Mr. TT swings around alongside me, in the wrong lane for him, just so he can remonstrate at me from his car. I flashed him the V sign and told him to f-off, at which point he pulled his car slightly across the front of mine and got out - just as the lights changed!

So I just drove round him and his car, laughing visibly at him as he stood there looking sheepish, and headed off down the M69. 30 seconds later, he comes alongside me and starts making ramming movements towards my car! Several times. My reasoning was that he did not actually want to damage his precious TT so I just ignored him and carried on in the inside lane at 70, and after a few more angry arm waves and ramming movements he drove off, at high speed.

I am not saying all Audi drivers at the same, but I think all male TT drivers might be. In my head, the only thing I did wrong was wind him up when he pulled up alongside me. I should have just smiled at him and doffed my cloth cap!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on February 26, 2016, 04:06:20 PM
I am not saying all Audi drivers at the same, but I think all male TT drivers might be. In my head, the only thing I did wrong was wind him up when he pulled up alongside me. I should have just smiled at him and doffed my cloth cap!

you will find drivers of larger German cars are easily wound up as basically they believe other (in their view lesser) cars are trespassing on 'their roads'  - they either already have one or catch an Ayrian ' Deutchland Uber Alles' mentality from the badge on their car.

German cars have their own lanes at roundabouts that have no dividing lines in them,  so they think they can just wander across the road without looking or indicating,  they have their own motorway lane ( the one nearest the central barrier) - they will overtake when traffic is coming the other way and never back off even when a head on collision is inevitable if someone doesn't give way - they expect the approaching driver to brake and pull into a hedge to clear 'their' road.

German badges definitely bring out the worst in the owner, and that means they attract 'road rage' as other road users give them a hard time and so the circle continues :'(

I know company car drivers who have almost committed suicide when offered a Volvo or Lexus instead of a BMW - just doesn't look as good on their driveway.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on February 26, 2016, 10:24:20 PM
Did you see these antics of one of those German sets of wheels http://www.bbc.co.uk/news/uk-35673488 (http://www.bbc.co.uk/news/uk-35673488) ?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: JohnnyJazz on April 13, 2016, 09:11:54 PM
Just changed from Jazz ES 2011 - covered 15000 mies at exactly 50 mpg indicated, (probably 45-46 mpg actual).
Had Jazz Si 2013 for one week and covered 200 miles so far at 49.6 mpg indicated. Just filled up for first time and on 3 mile journey home was reading 64 mpg - 5 speed cameras!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: pat36a on April 23, 2016, 03:01:37 PM
Owned my Jazz 1.2s 11 plate 16K for about a month now and my mixed motorway town mpg average is currently 55.7. Pleased with that.
Had a 1.2 Micra in the family for over 8 years, took it from 5K to 149K (worked it hard) mpg gradually increased over time from around 48 mpg in the early days to around 52/53 mpg in its latter years.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: jazzeck on April 26, 2016, 07:48:37 AM
14 plate 1.4 EX 18370 miles 45.2mpg, mine
62 plate 1.4 ES 30493 miles 47.1mpg, wife
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on May 13, 2016, 10:28:40 AM
Just set a new personal best in my Jazz - largely because I am doing a lot of motorway work this month. 60.2 on the computer - 56.2 actual.

Over the 2 Jazzes I have owned - a 2010 1.4 EX and a 2013 1.4 EX the gap between my lowest mpg and my highest is nearly 23 mpg. Lowest was 33.9.

Not sure if it's my imagination but I get the feeling that the facelifted Jazz is just a bit better on mpg even allowing for the amount of motorway work I'm doing at present.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: gthorpe on September 01, 2016, 02:58:06 PM
2009 i-shift gets regular 44mpg, I think the mpg gauge is stuck !

2011 Hybrid varies from 48-52mpg on driving lessons, but I refuelled before driving 60 miles home today, and saw the range go up to 500 miles, so as I flicked to the mpg, it was up at 66mpg, not bad after 176,000 miles.

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: TG on September 01, 2016, 03:19:30 PM
67mpg over 25 miles behind a lorry up the A1 on a very warm evening, but it was so boring; could have just hit 70 if the temperature hadn't faded.  58mpg over the whole 200 miles at a more reasonable speed.  A 14 year old car can still compare favourably.
--
TG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Rambler on September 17, 2016, 04:55:31 PM
With a lot more use of cruise control,  I'm now getting 45.7 mpg on decent long runs according to the computer.

Haven't a clue what that really equates to... ;D



Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: fatlad on September 18, 2016, 12:00:15 AM
just come back from 10 days in Norfolk.

with travelling there & back ( from Sheffield) and driving everyday = 57.3mpg

pretty good!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: pat36a on October 23, 2016, 07:07:32 PM
I have now done 8K in 7 months in my 2011 1.2S.
My driving is mostly on rural A and B roads with the odd 200 mile round motorway trip. I haven't re-set the trip computer in any way for months and my MPG has been 57 - 59.x for ages now. Once during a long 50mph motorway restriction I had a steady 63.x MPG.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Petrolhead9 on October 30, 2016, 07:47:07 AM
40 normally, which I think is great. It all depends on what YOUR happy with.

 Previous cars have returned as low as 19mpg average, big V8's.
On a long run up north once, before speed cameras, and after 1am,  a Citroen we had did 14mpg.
Averaged 88mph though.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: tgo on November 22, 2016, 04:23:33 PM
My 2011 1.4 ex manual, going to scotland and back, round trip of 630 ish miles gave me a solid 54.5 on the trip computer which is a good 20+ mpg better than any other car I've had, I'm not sure of the range though, I reckon on a run I might get around 350-375 to a tank (30 or so litres to fill from the yellow low light) does that seem a bit low?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: tgo on December 26, 2016, 02:41:07 PM
I'm happy with mine even allowing for as much as 15% out
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Willy Nilly on December 28, 2016, 02:25:00 PM
Mine says the average is about 48 mpg. The last tankful was an actual 41. something and I may have exceeded Her Majesty's speed limit a lot ever so slightly on that trip.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Perth Jazz on March 24, 2017, 04:56:06 PM
Hello everyone. I just got 68mpg on a run from Aberfeldy down to Perth (30 odd miles) and then 64mpg by the time I reached Scone airport  which was my destination. On the return, with a full car, I got 56 mpg so well pleased with that.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: tgo on March 24, 2017, 07:07:57 PM
That distance is a bit short to be accurate really, I could fill up so trip comp reset, and within 5 miles have something like 70 mpg.. but it's not really, not for that distance.

On the other hand I've had an honest 56.6 mpg on a 311 mile run at 60-70 mph. Because at those kinds of distance it's not an artificially created figure.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Bucknodd on April 19, 2017, 07:18:09 PM
Hi All,

Just joined the club. I have a 2013 Hybrid with 16,900 miles on it and about to get a new battery! I get between 44 and 52 mpg on local runs. Going further afield and it climbs to around 56 mpg.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: City Guy on April 28, 2017, 05:35:36 AM
43 mpg

2008 Mk 2 GE8 Honda Fit RS (Japan).

Hong Kong, city driving approximately 6-7 miles each trip, with aircon.

195/50r16 tires means they're slightly smaller than the standard wheels that came with the car, so I believe the mpg figure the computer gives is less than actual.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: BillyO on May 01, 2017, 02:05:47 AM
We just completed a 3,535km tour of central South Island, NZ in our 2013 Jazz Sport, 1.6l. For the whole 12 days we averaged 6.4l/100km = 44.1376mpg.I used Cruise control most of the time to avoid exceeding 104 kph (upper limit for the Cops), but occasionally drifted to 120 kph when passing MPVs & on some of the wide open straights. A lot of the roads were winding, and sometimes steep, especially to & from Milford Sound. I came in under budget for fuel costs subsequently ! ;D 8)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on May 31, 2017, 04:05:13 PM
I have almost done 4,000 miles in my current Jazz. Manual calculation of mpg (I have kept Trip B constant since getting the car) is 44.1 - the computer says 48.4.

So, over 4000 miles, the onboard computer is 10% out almost exactly.

I found this on my previous Jazz, my Civic and a VW Golf - 10% seems to be the discrepancy over a reasonable period with most of these gizmos. It varies from tank to tank but over a period - 10% is the figure.

Yes it would nice if they gave an accurate figure but I can work with 10% - tempted to ditch my manual calculations which I do on Fuelly.com except I'd miss the graphs and pie charts!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: tgo on May 31, 2017, 04:13:02 PM
10% is coincidentally the amount held in the reserve, I've discovered an average of 8-9% out

I've also noticed that now it's warmer I seem to  be getting lower MPG (it's not air-con as that's on all year round)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 31, 2017, 04:38:05 PM
My MPG has improved dramatically since the warmer weather has arrived. I don't have Air Con. Perhaps it is the warmer weather puts a greater load on the Air Con in the summer, and that extra load has to pull energy from somewhere.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on June 01, 2017, 10:44:12 AM
The other thing I've noticed is 44.1 is the mpg attained over a type of driving that is 50% city and 50% highway. I had to do a lengthy commute of 70 miles a day for a month last year and that has boosted my highway figure. I suspect my mpg will gradually fall back to about 40 which was what I got from my previous Jazz doing 80% city driving.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on June 01, 2017, 10:47:01 AM
10% is coincidentally the amount held in the reserve, I've discovered an average of 8-9% out

I've also noticed that now it's warmer I seem to  be getting lower MPG (it's not air-con as that's on all year round)

Actually I think 9% might be my figure to be strictly accurate. 91% of 48.4 gives just over 44.

Always assuming I'm doing it the right way round!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Medley on June 02, 2017, 08:41:15 AM
That's interesting about the trip comp

Ours says avg 44.something. Most of our miles are urban.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on June 02, 2017, 12:32:37 PM
It's interesting Medley but I've noticed this 9 to 10% discrepancy on 4 different cars although 3 were Hondas. Every now and then you'd get an odd reading that was outside of that 10% range - either over or under but over the long haul 9 to 10% seems about right.

On various forums I've seen claims that the computer is only slightly out but I am sceptical. That doesn't mean the computer reading is useless - far from it - but they tend to underestimate the amount of fuel used.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on June 02, 2017, 08:42:00 PM
I had a funny today. I topped up my tank at about a quarter full (I had a long journey and wanted a full tank before I started out). Display was showing 57 mpg so I expected to find it was around 55 (usual error). However, the calculated value was 50. I then noticed that I had put in 7.5 gallon, which is about what I get in from the fuel light first flashing (I stop at the first click off). I can only assume that the pump didn't click off when I expected and I managed to fill the neck. I'll see what happens at the next top up.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on June 03, 2017, 04:56:56 PM
Interesting Jocko. I stop at shut off but this must vary from tankful to tankful, from pump to pump and even from the pressure you apply when pumping.

It's why a true picture is only gained over several tanks.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: pb82gh3 on June 03, 2017, 06:15:33 PM
After 9 months ownership my Mark 2 Jazz Si 1.4 bought with 10000 miles on the clock has done 50/50 city/long distance driving. Most of the city drives are very short. My overall mpg is 39.7, single fill up best 50.76, worst 31.68 (when I first had it).
I'll have to try harder to meet the 47.9 quoted on Honest John's Real MPG website
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on June 03, 2017, 09:42:02 PM
As regards Honest John's website I think I'm right in thinking he asks people to submit readings from the car's computer as opposed to brim to brim manual method. This is inherently inaccurate as the computers are almost always about 10% out (give or take).

So I'd take the 47.9 figure with a big pinch of salt - it'll be nearer 42 in real life.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: pb82gh3 on June 04, 2017, 03:48:35 AM
My method is brim to brim so I feel a little better about my mpg now, thanks.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on June 04, 2017, 09:40:10 AM
To check how your driving style is affecting fuel consumption you really need to keep zeroing the trip,  from zero to about 50 miles traveled the average fuel consumption reading  is very sensitive to instantaneous fuel consumption, but after that it gets bogged down and slow to react as is averages out the instantaneous consumption over the miles traveled on trip.  This averaging slows down its reaction and in the end after about 100 miles the average mpg barely reacts to whether you are coasting downhill or climbing up mount Snowdon.

The MPG readout gets the fuel used data from injector open time (from ECU) and the miles traveled from the trip / speedometer - the Speedometer is normally calibrated to read 'fast' to make sure you don't get caught by speed camera etc.  so the car actually thinks it is going faster than it is (and covering more miles for petrol used) this 'safety margin' accounts for some of the 'optimistic error' in mpg readout.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on June 04, 2017, 09:54:41 AM
After 9 months ownership my Mark 2 Jazz Si 1.4 bought with 10000 miles on the clock has done 50/50 city/long distance driving. Most of the city drives are very short. My overall mpg is 39.7, single fill up best 50.76, worst 31.68 (when I first had it).
I'll have to try harder to meet the 47.9 quoted on Honest John's Real MPG website
Try driving as if the brakes don't work. The primary avoidable waste of energy is that lost in braking so more anticipation of the need to slow down saves fuel because you ease off the accelerator sooner. However, those short urban trips are a fuel guzzler particularly if cold engine and made worse by cold weather simply as more fuel is pumped into the cylinders unitl the engine is up to working temperature.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on June 05, 2017, 02:13:38 PM
I can achieve 14mpg from a standing start with engine cold driving 1 mile up the hill from our house..:-)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: chrisjazz89 on July 25, 2017, 11:44:14 AM
I clock my mileage between red light coming on (usually always comes on with a range of 34 miles remaining) and when I fill up e.g. red light comes on - I fuel up right away, reset mileage counter and then clock mileage until red light next comes on.

Based on this I get around 35-40mpg taking into consideration miles driven, cost of fuel (pence per litre) and spend of fuel when I fill up. Car computer tells me that this same period is average of 43-45mpg so there is a clear discrepancy between actual and what the computer thinks.

My driving is very mixed but I predominantly drive with windows up, air con off and usually just myself in the car with no extra weight. I'd say 80% of my driving is city/town driving on small journeys less than 3 miles and I drive around 180 miles per week.   
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: jazzster on July 25, 2017, 05:51:01 PM
I done low miles trips to work 3 miles there and back few trips of 7 miles checked mpg since I had car in Feb 16, from my own calculations I have got and average of 36.5MPG with a low of 33.5 and high of 41MPG, my car ave mpg is about 3 higher than my calculated, car only just gone past 10000 miles on 15 plate, only average 356 miles a month since I purchased it 11 months old.

My previous Jazz Ishift Ave was 40mpg with ave of 412 miles a months just slightly better than the CVT, 44.4MPG was the best 33.3MPG the worst on the Ishift .
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ocky on August 20, 2017, 11:58:19 PM
42 mpg since I bought the car in December 14, covered around 35k miles mixed driving
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fido on September 13, 2017, 04:05:02 PM
Our 2014 automatic has now covered 22000 miles at 49.3mpg. Mainly rural driving in the New Forest and trips to major urban centres like Southampton and Bournemouth. No long trips these days.
Modify message
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on September 14, 2017, 03:58:40 PM
Interesting week on the mpg front. Had a UK holiday and drove from the North West to Cornwall via The Malvern Hills. We did quite a bit of driving - 960 miles to be exact. 3 tankfuls (just did the last one today).

1) This one - about 311 miles - involved the trip down to Malvern and some local driving about then the continuation to Cornwall. Average speed around 45 mph and an mpg of just on 47 mpg. Quite disappointed but I had forgotten how hilly that A30 running through Cornwall is. There was also torrential rain at times. When I could I drove at 70.

2) The second tank included quite a bit of driving round Cornwall. A roads, B roads, narrow country lanes and the first part of our journey home (via Bath where we stayed one night). Better this time at 49.3. Ave speed 41 mph

3) Filled up today and this includes most of our journey home - mainly motorway with a few country lanes on the way to our overnight stop in Bath. 53.2 which I was happy with. I took a decision to cruise at around 60 ish - basically at the speed of the faster trucks but blipping up to 70 or 75 to get past clusters of vehicles.

Last time I did this type of driving I was in a diesel VW Golf (1.9tdi) which I would expect to get well over 60 mpg cruising at 70. Clearly the little petrol engine in the Jazz has to work much harder and 70 mph on the motorway might result in relatively disappointing mpg. At 60 ish on a longer journey, well over 50 mpg is easily achievable.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on September 14, 2017, 04:08:05 PM
I find motorway driving returns disappointing mpg. I found the best bet is to sit in behind a truck doing 55 - 60 mph (not too close - those bars on the back are rather solid) and take advantage of him pushing the air aside. 55 - 60 seems to be best for mpg as well and sitting behind the truck doesn't p** off other motorists, as you might do on your own.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Riobinman on September 16, 2017, 10:11:29 AM
45.5 mpg (calculated) averaged over 51000 miles.
The display offers an optimistic 50.6.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: 123Drive! on September 27, 2017, 01:20:34 AM
38-42mpg, mostly town driving and used by learners. Only 260-270 per tank! But today up to 289! The garage tells me 350! But never really got there. Best tank full was 303.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Johncb500 on October 07, 2017, 09:47:37 PM
 as a new owner,of a 2012 EX CVT  model,

 basic local running around 50mpg,I recently did 2 trips up to Yorkshire,from my home in Hereford,round trips 390 miles
computer says about 57mpg,

 both cases started with a brim full tank,and on returning filled up with 31 liters and change ,the low fuel light came on just as I got near home,

 very pleased,its better than a Yaris !!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 02, 2018, 01:59:32 PM
Iím attempting to see how far I can take Hypermiling in a budget.

I commute 150 miles a day so good mpg is a big deal for me.

I have an 09 1.4 ex

Iím logging all my mpg for each journey.

The first week of driving in a normal manor returned an MPG of approx 48.

Ive recently removed the rear seats, ariel stalk, rear seatbelts and boot tray, anything that doesnít need to be there is gone. And I only keep half a tank of fuel.
So far Iíve run about 58 Mpg avg. with the highest run at 60.0 mpg

It should be good for some better results when itís nit so cold and Iím not battling wit snow etc!

Looking to have the car lowered in the next month, and the panel filter is desperately in need of changing.

Iíd really like to swap out the oem 16Ē alloys for the 15Ē ones but I canít afford to buy unless someone here fancies a direct swap!? 😀

To be continued ...


 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 02, 2018, 02:01:07 PM
Just to add the the starting weight of the Jazz was 1100kg

I have her down to approx 1063kg and aiming to get more out!

Iíd like to be under a Tonne but thatís unlikly!


EDIT: To add that Iíve just been down to have her weighed again and sheís down to 1040kg! Pretty happy with that, under a tonne might not be impossible!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 02, 2018, 06:11:25 PM
How much do you weigh?

Do you use EOC?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 02, 2018, 06:53:20 PM
69kg, so around 1109kg with me in it. (The curb weight being aboht 1119kg I think)

I use P&G which is pretty effective as I have to climb over the penines to work. Reducing the weight helps me climb it (although it does marginally reduce the distance I can glide)

EOC is that similar or does that require turning the engine off? Um...maybe I donít understand but wouldnít the steering lock turn you into firey death pretty quick!😀
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: TG on March 02, 2018, 08:15:20 PM
....maybe I donít understand but wouldnít the steering lock turn you into firey death pretty quick!😀
Don't take the key out....
--
TG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 02, 2018, 08:25:53 PM
69 Kg is not bad. I could afford to lose more weight than I could strip out of the car!
I wouldn't contemplate EOC as the steering gets too heavy and you can lose the brakes after a while. Steering lock won't come on unless you remove the key, but there is no need to go past the Acc  position anyway. P & G is useful. I make use of P & G with DFCO, but a bit of coasting in neutral with the engine on is a handy hypermiling tool.
I have a ScanGauge E fitted to my OBD II port and it returns all sorts of useful information.

(https://i.imgur.com/qV2N6DN.jpg)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 02, 2018, 11:47:34 PM
Don't take the key out....
--
TG

That canít be right surely? With the ignition off doesnít the steering lock activate? I know is that did on older cars!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 02, 2018, 11:53:49 PM

I have a ScanGauge E fitted to my OBD II port and it returns all sorts of useful information.



Whatís DFCO! (Iíve been in the wilderness a while!)
Iíd love a scan gauge, but as this is a cost saving excercise I canít justify it! I looked at the blue tooth Obd2 plug ins that work with an app,  but I donít want to get burned and donít know enough aboht them to comit.

P&G for me has been really valuable, once Iíve reached the top of the penines there are long stretches where I can coast for ages. It can add another 10 mpg on by the time I reach work!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 03, 2018, 08:49:31 AM
DFCO is Deceleration Fuel Cut Off. Most modern fuel injected vehicles (including the Honda Jazz) shut the fuel off entirely when you remove your foot from the accelerator. Provided the speed/gear selected is sufficient to keep the engine revs above tick over (actually around 1800 - 2000 rpm) then you use no fuel whatsoever. This is where the ScanGauge comes in handy (Mk 1 Jazz doesn't have instantaneous mpg on the dashboard display). On steeper descents it is better to remain in gear and use no fuel than coast in neutral, and use tick over fuel. The secret of good fuel management is to balance the use of the two, and this is where an instantaneous mpg gauge earns its keep.
Regards steering lock. Try it for yourself. While parked, turn the ignition off but do not remove the key. You can then turn the steering from lock to lock (not easy with no power steering or vehicle movement) and you will see the steering lock doesn't function. However, for EOC you just need to turn the key back one notch, to the Accessory position. That turns the engine off but won't allow you to remove the key.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: TG on March 03, 2018, 11:11:05 AM
You can use the cheap OBDII dongles for this purpose, I can link my <£5 Elm327 Bluetooth dongle to my phone, I can see the instantaneous mpg and put it on a graph plus log it to a file if I wish. It's quite interesting to put the engine load graph against the mpg graph and throttle position.  The other one that varies a lot is the timing advance but that is not really something you can use for analysis while driving.  Can't say I bother doing this much as just driving in a sensible manner is enough without the distraction of a second screen.  The dongle also comes in handy for checking/clearing fault codes if needed.
Some cars leave the OBD port powered all the time but the Jazz turns it off so you can leave it plugged in all the time without draining the battery.

And re: the key - the lock only re-engages when the key is removed but as above you would never switch off completely, (power steering and brakes are more desirable than saving a few pence) it won't be an issue.
--
TG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: d2d4j on March 03, 2018, 11:23:30 AM
Hi TG

Iím sorry, are you sure the odb2 is powered off fully when keys removed

We use an AA cargenie and it is able to communicate to the odb2 plug from their mobile app on phone

I know because currently the car has not been used since yesterday and I have a warning over low voltage from car genie. Guess this means I need a new battery

Many thanks

John
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: d2d4j on March 03, 2018, 11:26:27 AM
Sorry, hereís a screenshot of battery warning

Many thanks

John(https://uploads.tapatalk-cdn.com/20180303/5642f5c97cd0f7927e367525d84a39f2.jpg)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 03, 2018, 01:10:25 PM
Sometimes when I open the door, the ScanGauge comes on, so the OBD II port must have power to it without the ignition being on.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Willy Nilly on March 03, 2018, 05:41:54 PM
Mine 2011 ES shows a bit over 49mpg for the last 6000 miles. I think it's generally about 10% over so 45ish in real money. It's mostly pottering about town doing short trips. Best I've seen on the dash is 64.9, but that was hard work. It really needs thrashing to get it to show under 40. To many cameras now to see break my land speed record on Christmas morning and see what high load fuel consumption is. Might do that in Germany this summer...
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: TG on March 04, 2018, 02:09:36 AM
Hi TG

Iím sorry, are you sure the odb2 is powered off fully....
Well in my GD the OBD dongle led extinguishs when I take the key out (in the MX5 it stays lit, maybe it's on a timer but it runs the battery down from experience).  The MK2 or 3 may be different. My dongle does not contain it's own battery.
--
TG
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 06, 2018, 11:54:28 AM
What apps are people using with their obd2 port widgets?

Some great info here guys thanks!

Not sure about coasting down hill in gear, surely the gear ratio even in 5th causes some engine breaking? In neutral I can pick up some speed
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 06, 2018, 12:39:32 PM
Not sure about coasting down hill in gear, surely the gear ratio even in 5th causes some engine breaking? In neutral I can pick up some speed
That is where you have to manage it. If you are descending a hill where you will have to brake then leave it in gear. If you have a long shallow descent where braking is not required, stick it in neutral. One road I use regularly (because it is so fuel efficient) has a couple of short sharp climbs, then some lovely descents. To begin with the road is steep and twisty, so I use 4th and sometimes 3rd gear. This gives me engine braking AND enough revs to keep DFCO active. Then there is a long descent with a bend 1/3rd of the way down. I stick in 5th then as I round the bend I select neutral and let the speed build. At the end there is a gentle rise to a 30 mph limit so I coast in neutral to there (well in the summer I do. In the winter, with wet roads, I have to add power about 50 yards from the 30 zone). It is all about managing the inertia, and be aware, the heavier the vehicle, the better it coasts!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on March 07, 2018, 03:32:56 PM
Definitly aware of weightbaiding gliding, but I have that many steel ascents   working out better loosing weight.

Ultimately it seems weíre in terrotory where mods are dependant in usage.

Itís why I also want smaller wheels, I donít do enough consistent flat runs to make larger ones work
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on April 11, 2018, 12:41:22 PM
I make use of P & G with DFCO, but a bit of coasting in neutral with the engine on is a handy hypermiling tool.


(https://i.imgur.com/qV2N6DN.jpg)

Iíve altered my driving style to make the most of DFCO and already noticed a difference. Iím still coasting for the longer sections (3 looong ones) as otherwise the engine breaking in fifth fouls me so bad I end up having to give some gas again negating any advantage. And the idling fuel work out better over. Longer coast.

I have an obd2 dongle to an app on my phone which is a revelation! A lot of really handy monitors.

Cars seem to have changed so much in the last 20 years that Iím having to relearn lot. I spent a long time in the no car wilderness as I didnít need one! Iím not even that old! 😂
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on April 18, 2018, 12:27:28 PM
I was just reading aboht both the mpg petrol world record holder a Honda Jazz that did from lands end to JOHN oígroats on one tank of fuel and hitting 95mpg

Has anyone read aboht it or have any idea how they achieved that?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on April 18, 2018, 12:36:57 PM
https://www.theaa.com/about-us/newsroom/fuel-economy-record-attempt (https://www.theaa.com/about-us/newsroom/fuel-economy-record-attempt)

Discussion here:
https://clubjazz.org/forum/index.php?topic=9484.0 (https://clubjazz.org/forum/index.php?topic=9484.0)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ed the Jazz on April 27, 2018, 11:14:08 PM
My 2004 CVT Sport MPG varies greatly depending on temperature and traffic. Through town with lot of stop start and traffic traffic lights can be as low as mid to top 20's particularly in winter. Same type of journey in summer can give low to mid 30's. On a steady run on A/B roads at 40-50mph can achieve mid 50's. Possible on a country ride I am getting more than that when average MPG is mid 30's at start of journey and ends at mid 50's after about 40+ miles of steady driving. Not keeping it in D also alters mpg.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on April 28, 2018, 09:19:49 AM
I have a ScanGauge E fitted and that gives me instantaneous mpg indications, which are most enlightening.
(https://i.imgur.com/qV2N6DN.jpg)
It also displays the average for the current journey (I only reset the Honda on-board indication every time I fill up).
Temperature, traffic, gear selection, use of DFCO (Deceleration Fuel Cut Off), new tyres or worn tyres, all make a huge difference to mpg.
In slow moving traffic I find keeping in as high a gear as possible helps (moot since you have a CVT). On an A road or motorway I find an indicated 58 mph seems to return the best cruising mpg, but I find that rural roads (most of my out of town driving) return my best figures.
I also find that climbing in 5th, with lower rpm and higher throttle amounts, gives better figures than changing down to 4th or 3rd, with attendant higher revs and lighter throttle.
Yesterday I had an early morning trip into Edinburgh, with queues onto the Queensferry Crossing, queues to join the M8 and slow moving traffic for the remainder of my trip (how those that have to put up with that 5 days a week manage, I don't know). I then had 4 short 3 mile trips, in the city, with long queues, before a relatively leisurely return home, at lunch time. I still managed 51 mpg for the day (as against my recent 54 - 55 mpg for similar weekend journeys.
Being able to monitor mpg can make a huge difference to driving habits, if like me, you like to play the mpg game.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on May 01, 2018, 12:04:35 PM
Good to hear your thoughts on 5th gear climbing vs a lower gear, Iíd felt the same.

Iím cruising up hills at 57 and then P&G from 65 down to 50-55ish.

Rural roads at 40 are where the real gains are!

DFCO wherever possible, but in gear coasting for longer stretches when I donít have to brake
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on May 10, 2018, 08:27:49 AM
Went all out for a new record last night on the way home from work. I lucked out as I managed 14 miles behind a crane which are limited to 30mph! :)
Made full use of EOC and DFCO, and got lucky with the weather and traffic .

Drumroll.....


73.5mpg

😱😱😱
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 10, 2018, 08:58:41 AM
EOC. Engine off or engine on? I never coast with the engine off other than the 10 feet out of my garage. Either way, that is a tremendous figure. My calculated best between fill ups is 64.0 mpg. But that was only 99 miles and hardly accurate. Managed 64.26 for a tankful, and 434 miles.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on May 10, 2018, 12:11:38 PM
As can be seen from my avatar I collect data on my mpg to the point of obsession. I try to drive economically as well but I often wonder if I shouldn't just get a life and stop counting! Talking to a mate of mine recently he said he didn't count mpg but used miles per £20 note!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 10, 2018, 01:22:30 PM
I treat it as a game, to the extent I would go 100 miles to get 50 mpg rather than 50 miles to get 49, if you know what I mean. I don't worry about what I spend on petrol (within reason). That doesn't figure in the game!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on May 10, 2018, 10:38:09 PM
I think I would agree with that. Given the small mileage I do, cost isn't an issue but I do like logging things. The question is - how far would you go to get those few extra mpg/
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 11, 2018, 06:04:19 AM
I won't do engine off coasting. I wouldn't go to the hypermiling extremes of removing mirrors, wipers and other mods. And I still do very short shopping trips, though I try to group them all together, where I can.
I won't drive in a manner that inconveniences other road users (unless it's s BMW). I don't leave my car outside the garage, preferring to put it away every time, even though that means bringing it out 3 or 4 times a day. We are at the mercy of seagulls here (Five storey flats, by the sea - cliffs!), who seem to defecate as part of their landing and taking off procedure.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on May 11, 2018, 12:30:29 PM
Itís a bit of a game here aswell. I have a large mileage at 160 a day, cost is for me an issue.  I donít (but probably should) track MPG over the course of a full tank. Iíve really been experimenting with what does and doesnít work so i guess thatís the next step once Iím happy with where I am with it.
My recorded mpg on the dash over the last 8k miles is over 50 and climbing. Itís lower in part because I started out standard driving/car and slowly implemented changes to driving style and car.
Although Iím enjoying 60ish average I think.
Ultimately Iím aiming to save money through Hypermiling but Iím not being too hard on myself! Trying hard to make the commute fun and not a Labour!

Oh and because I enjoy the occasional hoon! Stupid given what Iím trying to achieve, but sadly the bigger picture here is that i donít
want to loose concentration on the motorway during rush hour so occasionally get up to speed to refresh my mindset. Itís a huge relentless commute thatís so far been littered with close incidents ( worst being the near head on collision with a car facing the wrong way in the fast lane!)

Iíve modified the car sensibly and to a limit. The car needs to be safe and practical. And the same with my driving. P&G in a manor that doesnít upset the flow of traffic and EOC (off) only when itís safe to do so.

I have however made it look like a boy racer car! Bonkers, but then the sheer amount of times I got cut off when Iím trying to overtake and then having to hard brake was destroying my mpg and frustrating! 
Now...no-one gives me a hard time! Probably because they all think Iím a 17 year old with a shiny new licence and no heck ls given 😂
Thankfully itís not our family car, but soley a commuter car so I donít ha move to be seen in it for family functions etc!  Although... it has grown on me!
Hey...if itís stupid but works itís not stupid right?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Robbie on May 28, 2018, 05:45:08 PM
Around town 35+ steady motorway driving around 46
Computer shoes 53+
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Ed the Jazz on May 28, 2018, 10:14:45 PM
2004 sport cvt with 136000 miles. Round town with stop starts and traffic queues migh av 27-35mpg. Once out of town on slow country roads this av can rise to low 50s. Working on fill to fill av is usually 45-51mpg and has been since 2004. Best overall results when run 40-60mph.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 29, 2018, 06:49:50 AM
I am loving this lovely warm dry weather Scotland is currently experiencing, and so is my Jazz. My ScanGauge is showing an average of 56 mpg on my daily commute around town. For my two hour drive on Friday (an equal mix of town country and motorway driving) it showed 59 mpg, and my most recent fill up returned a calculated mpg of 63.4.
The figure, below my avatar, is my calculated average (Spiritmonitor.de), for the two years and 49 fill ups since buying the car. I am well chuffed with the Fuel Efficiency of the beasty.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Brian_I on July 15, 2018, 05:11:40 PM
Still getting used to my new to me 2013 Honda Jazz 1.4 i-Vtec ES Plus.

A cycling event today, with the mountain bike in the boot. 60 mile round trip from home to the start venue at Dalkeith along motorways keeping up with the traffic rather than cruising at say 60mph.

50.3mpg average according to the trip computer by the time I got home!  Amazing stuff!   :)
 The best I ever got out of my old 2013 Vauxhall Meriva was 36.8 (calculated manually using brim to brim tank fill up as that car didn't have a trip computer).

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on July 15, 2018, 05:35:06 PM
I have a 70 mile round trip to Dalkeith, almost every weekend. I am in Fife.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Brian_I on July 15, 2018, 06:15:28 PM
I have a 70 mile round trip to Dalkeith, almost every weekend. I am in Fife.

I'm in Fife, also, (Dunfermline!)  :D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on July 15, 2018, 08:28:25 PM
I'm in Kirkcaldy, though I used to rent a flat in Rose Street before moving here. Originally from Burntisland.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Brian_I on July 18, 2018, 07:52:10 PM
I'm in Kirkcaldy, though I used to rent a flat in Rose Street before moving here. Originally from Burntisland.

Spooky!  :o  I'm originally from Burntisland , my parents first house was literally next door but 1 from the Alcan works!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: simty on July 30, 2018, 10:56:02 AM
350 miles on a full tank is my average. 320 lowest 390 the most.  And it's done over 100,000 miles.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: MichaelC on August 23, 2018, 02:13:30 PM
I think mine's a 1.4L VTEC EX model...?
Very happy with 36-39MPG urban driving, and even got up to 70MPG on my road trip along motorways along the south coast of England!
Still wished that there was a hybrid available when I bought mine, but so far quite happy :)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Fell Viper on September 25, 2018, 06:55:15 PM
Been a while since i posted. Ive probably got as much as im going to get out of the jazz for now, a few ideas yet but as the weather has turned i doubt ill be setting any records until next summer.

My current highest MPG reading score is...

81.7! 😂

Thats 78 miles in 30į heat over the penines in rush hour. Which frankly is a bonkers reading! And one im unlikly to beat until next summer!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: doboy on November 07, 2018, 03:21:38 PM
ive got a low mileage 2013 1200cc jazz . I drive using the gear change sign on the dash & my average  is 55-60mpg.. a lot say the jazz is poor on fuel , but ive not found that   ;D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on November 08, 2018, 08:33:17 PM
ive got a low mileage 2013 1200cc jazz . I drive using the gear change sign on the dash & my average  is 55-60mpg.. a lot say the jazz is poor on fuel , but ive not found that   ;D

The Jazz has always had a good reputation for economy. Honest Johns RealMPG https://www.honestjohn.co.uk/realmpg/honda/jazz-2008 (https://www.honestjohn.co.uk/realmpg/honda/jazz-2008) shows the Mk 2 Jazz as averaging 90% of the official mpg. Compare that with the rivals.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Tommo2 on November 25, 2018, 06:13:19 PM
My 2013 1.2 consistently does about 10 miles to the litre, or 45.4 mpg, I don't drive economically. Bit more on a long run. That is what I put in the tank. Not the onbboard computer.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Redragon7 on November 27, 2018, 01:09:37 PM
Same as Tommo, even though driving under the most un-economical conditions (cold engine, many very short trips and stops). Very glad for the time being
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on January 04, 2019, 01:33:52 PM
I'm in Kirkcaldy, though I used to rent a flat in Rose Street before moving here. Originally from Burntisland.

Spooky!  :o  I'm originally from Burntisland , my parents first house was literally next door but 1 from the Alcan works!

Drove up to Kirkcaldy  before New Year to brother's 70th birthday do. Drove back again next day. 550 miles at an average 49 mpg - 65-75 mph.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: smilertoo on January 04, 2019, 06:39:27 PM
49mpg in a normal jazz? not a hybrid or some such thing. Since it got colder im down to 38.1mpg and falling.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on January 04, 2019, 10:24:46 PM
Drove up to Kirkcaldy  before New Year to brother's 70th birthday do. Drove back again next day. 550 miles at an average 49 mpg - 65-75 mph.
According to the computer  (invariably optimistic) or the fuel into the tank?

Nonetheless, long trips let the engine warm up properly and that period had relatively benign weather by winter standards (moderate temperatures and not much wind (which can substantially reduce the mpg).
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on January 05, 2019, 06:04:54 PM
According to Fuelly.. http://www.fuelly.com/dashboard

So miles and tankfill liters.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Kenneve on March 15, 2019, 05:32:52 PM
Have just returned from my usual Friday afternoon jaunt from Solihull to Stratford-on-avon.
This 35 mile round trip is along the A3400 which is restricted to 50 mph and the outward journey is always better than the return for fuel consumption, since it is mostly downhill on the way out, Stratford being roughly 70ft ASL whereas my house is 437ft ASL

Today's results are something of a record for me, (see attached photo) in that the outward trip recorded 68.5 mpg, which is probably in the order of 8 mpg better that normal. I can only assume that this was down to a strong tailwind due to the windy weather we are having at the moment.

Having said that i'm surprised that the return trip was as good as it was at 56.0 mpg
Obviously the real world figures will be a couple of miles less, but nevertheless i think a good result.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 15, 2019, 06:07:53 PM
Excellent numbers, especially at this time of year. Love to see what you would have got had it been a summers day.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: rogbro on May 25, 2019, 04:59:54 PM
38, over 1,100 miles last month, Delighted.
 Mini Cooper S before produced 19 on average, 25 on a run, perhaps that was why the road tax on it was so high. 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 25, 2019, 05:18:54 PM
I'm glad you're pleased.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: UncleZen on May 30, 2019, 08:51:05 PM
I get better mpg from my 2.0 petrol mazda 3 than my wife gets on her 1.2 honda jazz. On a run at the national limit I get get 57mpg on the display and my calcs suggest that the display reads up to 5% high. So not to shabby for a 2 litre, way better than the smaller jazz.

Sent from my Hudl 2 using Tapatalk

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on May 30, 2019, 09:06:33 PM
I get better mpg around town than I do on a run. A 6th gear would help but my 1.2 is obviously designed, primarily, for town use,
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Paul22118 on July 29, 2019, 04:04:49 PM
In my I Shift Jazz overall, lots of motorwFor a nippy little car that is brilliant in my book.ays and rural roads, I am consistently getting 54 mpg.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on July 29, 2019, 04:12:12 PM
Excellent. Is that figure calculated or as displayed on the dashboard read out?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: snazzyjazz on August 05, 2019, 11:17:15 AM
My dash reads 45.9mpg. My car has been pretty much stagnant, it's only done 1,000 miles over 2 years so I'm glad I've taken ownership of it as it has lesser miles than a lot its age, and it means I can use it for what I need without worrying about running over the clock anytime soon.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Martin Haworth on August 11, 2019, 08:20:37 AM
2013 si - only had it one month.

Just got back from a 1500 mile holiday, over 2 weeks. Fully loaded with family, dog and cases.

Norwich to Mull. Mull to Arran. Arran to Norwich. A mix of high speed motorway miles (c800), A roads (c400), minor roads (300).

Indicated 51mpg for the whole trip.

Really surprised at how the economy nose dives over 65. As you get towards 80mph it really drinks!

Cheers

Martin
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: pintofale on August 13, 2019, 08:23:19 AM
According to the computer, 42mpg in normal use (6 miles each way to work and back each day, gentle-ish driving) on my 2010 1.4 with 60k miles, but it's probably suffering from the engine being cold for most of that.  Went to south wales in it back in the spring and it reported 49 for the trip, so there and back plus some short trips, with a full load and mostly 80 on the motorway.
Occasionally I get bored and hoon it, and I notice that takes a big chunk off the "miles remaining" figure after a few minutes.  It suspect it does not-very-many to the gallon with the performance cam profile in use.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on August 13, 2019, 09:17:32 AM
2013 si - only had it one month.

Just got back from a 1500 mile holiday, over 2 weeks. Fully loaded with family, dog and cases.

Norwich to Mull. Mull to Arran. Arran to Norwich. A mix of high speed motorway miles (c800), A roads (c400), minor roads (300).

Indicated 51mpg for the whole trip.

Really surprised at how the economy nose dives over 65. As you get towards 80mph it really drinks!

Cheers

Martin

Interesting. I'm doing a similar, albeit shorter because I start further north, trip next month. Warrington to Motherwell area for a one night stop, then over to Arran via Ardrossan and back to Dumfries and Galloway (staying in Kirkudbright).

The last longish trip I did in the UK was 2017 down to Cornwall (I had a Mk2 then) and I remember being disappointed with the mpg on the way down. 47 mpg actual cruising at an indicated 70 mph most of the way. It was wet and the other factor down there is gradients on the M5 then A38. In the same car, the previous year, I had obtained my best ever actual mpg of just over 56 mpg in the same car. This was motorway driving but it was almost impossible to reach 70 due to the volume of traffic.

Small cars are not good at high speeds - no car is really because of the drag factor - but I remember getting 67 mpg out of a diesel Golf at a steady 70 sometime up to 80 on one UK holiday. At that speed the engine was doing little more than a fast idle!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: John Ratsey on August 13, 2019, 02:29:31 PM
Really surprised at how the economy nose dives over 65. As you get towards 80mph it really drinks!
It's a relatively high vehicle so not particularly aerodynamic - a necessary compromise to provide class-leading internal space within a relatively small road footprint. Plus, if you've got the manual gearbox then the revs are a bit high for optimum efficiency - the CVT is better in this respect. If you are happy to cruise at lorry speed then you'll see much better mpg. Unless, of course, you can choose a day with a good tail wind and avoid any head winds.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: jazztragic on August 28, 2019, 02:24:01 PM
This is a bit of study I did a while ago. The Honda Jazz (1.3) GE is most frugal out of my other car and motorcycles!

Honda Jazz GE 1.3L Auto (year 2013)
Fitted with Pivot 3-drive THC throttle controller,  set in EC5 mode
(note that this is a genuine one. EBay versions might be fake and I had to refund it)
Dashboard indicated 5.7L / 100km
Bonbeach - Wilsons Promotory - Inverloch
417km / 25.5L / $28 (ron 91)
= 16.4km / L
= 6.12L / 100km (46.16 mpg UK / 38.4 mpg US)
= $6.71 / 100km

Melbourne - Cann River - Canberra (713km, 10hrs)
Canberra - Adaminaby - Tumbarumba - Albury - Melbourne (1,049km, 11.5hrs)
About 50km of dirt and gravel road, used manual shifter
EC4 setting on Pivot 3-drive Throttle Controller
1,762km / 119.39L / $134.32
= 14.75 km/L
= 6.78L / 100km (dashboard indicated 6.3L/km)
= $7.62 / 100km


Kawasaki GPz900R A7 (year 1990)
Completely stock engine/carbs/pipes
Bonbeach - Gembrook - Reefton
385km / 25L / $28 (ron 95)
= 15.2km / L
= 6.57 / 100km (42.99 mpg UK / 35.8 mpg US)
= $7.27 / 100km

Yamaha R6 (year 2000)
Stock engine/carb, Screaming Demon pipe with noise restrictor
Bonbeach - Reefton - Black Spur
300km / ?L / $23 (ron 95)
= $7.67 / 100km



Toyota Landcruiser Prado 3.4L Auto (year 1996) 8 seats
Fitted with non-injection LPG


Melbourne - Goolwa (SA)  round trip with Trailer
1,635km / 327.1L LPG / $226.71
= 4.99km / L
= 20L / 100km (14.1 mpg UK / 11.7 mpg US)
= $13.8 / 100km

Bonbeach -Walhalla gravel track/camp
366km / 79.1L LPG / $44.2
= 4.6km / L
= 21.6L / 100km (13 mpg UK / 10.8 mpg US)
= $12.07 / 100km

Using Petrol (91)
Bonbeach - Bendigo via south melb. heavy traffic, strong winds througout
202km / 29L / $33.63
= 6.96 km/L
= 14.4 L/100km
= $16.6 /100km

Bonbeach - Canberra via East coast return trip
Using LPG and about 300km of petrol
2,100km / $375
= $17/100km

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 28, 2019, 02:31:20 PM
Welcome. Bet the bike was ridden a bit more spirited than you drove the Jazz!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Martin Haworth on September 01, 2019, 02:37:24 PM
Disappointed with my mpg after c3000miles, a steady 50 on runs, i added redex advanced fuel system cleaner before a long run.

So, Norwich to Darlington and back. No air  con, mainly 50 to 70.

440 miles, average 61.5

Really happy with this.

Martin

Fyi, on previous runs I probably did use ac and perhaps was north of 70 some of the time.

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on September 01, 2019, 04:33:19 PM
That is a good figure. I find 53 mph on my GPS speedometer (just under 60 as far as the car speedo is concerned), gives me my best touring mpg.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: kokola on September 12, 2019, 11:25:27 AM
From July to September, Central European region:

5,7 L/100 km, very mixed cycle (urban and motorway), mostly with AC on, summer tyres.

Will reply again after winter.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on September 12, 2019, 11:36:23 AM
My overall average with my Mk 1 (3+ years) is 5.1 L/100 km.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Steve1962 on September 14, 2019, 11:42:45 AM
Currently getting 49.6mpg showing on the display from my 61 plate 1.4 ES, which is not too shabby.

Steve
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: smilertoo on September 29, 2019, 05:09:03 PM
I'm almost always in ECO mode and im still only getting 45mpg; how can people be getting nearly 60.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on September 29, 2019, 05:44:13 PM
I'm almost always in ECO mode
Your profile says a 2004 Jazz. Take it you have a Mk 2 as well
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: smilertoo on September 29, 2019, 05:47:45 PM
yes i have a 2013 now.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: JRHPNG on October 31, 2019, 09:09:07 PM
We have an 09 Sport (1.5) and only get around 28MPG around town, thats with a fairly light foot too... :(
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: springswood on November 01, 2019, 08:31:31 AM
That does seem low. I presume you use imperial gallons and not US ones down there.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: JRHPNG on November 02, 2019, 08:33:01 PM
That does seem low. I presume you use imperial gallons and not US ones down there.

Using US. With imperial it's just over 33mpg.

That's around town and with a light foot. On the open road on a long trip we see 38/43mpg. That's using the computer and reset each time we fill.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Paul22118 on November 18, 2019, 01:27:56 PM
MkII i shift Jazz on 59 plate with 63k on clock.  Varied usage with regular motorway journey - still returning 51.5.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on November 18, 2019, 02:17:00 PM
still returning 51.5.
Is that a calculated figure or from the dashboard display?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sparky Paul on December 11, 2019, 04:37:08 PM
Other half's mk2 has dropped to fibometer reading of 44-45mpg for some reason, after reasonably constant 51-52mpg.

Not exactly sure what's going on yet. No warm hubs, seems to be running okay.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on December 11, 2019, 05:33:54 PM
Could be the change in the weather. I assume you have checked the tyre pressures?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sparky Paul on December 12, 2019, 05:35:29 PM
Could be the change in the weather. I assume you have checked the tyre pressures?

I was going to do that this afternoon, but it's piddling it down... and I seem to have misplaced the pressure gauge. I'll have a look tomorrow, other half would happily drive around on four flat tyres.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on December 12, 2019, 06:28:54 PM
I was going to do mine too, but it was pretty miserable. I'll wait for a nice dry, sunny morning.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: sparky Paul on December 19, 2019, 12:34:37 PM
I took it out for a good run, I very rarely drive it. I think we have a binding offside front brake. It's not bad, but the disc is noticeably warmer than the other side. Can't find anything else wrong, so will have to start with that.

Can't get mpg above 44 on the fibometer, usually over 51.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on December 19, 2019, 02:28:15 PM
Sounds like that could be your problem. One of the benefits of regularly tracking your mpg is you soon know when something is off.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: gharris1975 on January 19, 2020, 02:38:13 PM
I have started a spreadsheet and using the clock (odo) reading and how much petrol I fill up at the petrol station, I average around 42.5 MPG. The sort of driving I do is a mixture of motorway, main road and local roads.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on January 19, 2020, 04:12:52 PM
Knock 10 mph off your motorway speed, check your tyre pressures every week, anticipate instead of braking where possible. See what that does to your mpg.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jadze on March 20, 2020, 05:59:53 PM
Just want to share that did a few upgrades on my Jazz CVT 1.3 and now doing 48-55mpg instead of 34-42mpg before.
1. Changed new front tyres (toyo proxes cf2).
2. Start adding Redex fuel additive.
3. Switched from Morrisons fuel so Sainsbury's fuel.
4. Started use engine braking with paddle shifters.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on March 20, 2020, 06:30:57 PM
Done the same over time. 1 and 4 made a difference, 2 and 3 had little effect.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 02, 2020, 10:15:00 PM
Wouldn't engine braking using the paddles in the CVT add undue wear on the gearbox?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 02, 2020, 10:20:42 PM
How does the onboard computer fuel economy thing work?

I reset the odometer about a 100km ago and have been driving sedately since and it pretty much continuously says 8L/100km average fuel economy.

Someone mentioned somewhere that the average is linked to how far back you reset the odometer, the shorter the time the more responsive it is.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: equaliser on August 02, 2020, 10:51:29 PM
Wouldn't engine braking using the paddles in the CVT add undue wear on the gearbox?
Don't see how. No difference in accelerating or engine braking forces on the CVT, the steel belt is a push type.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 02, 2020, 11:00:16 PM
I just reset the "Fibometer" at top-up time, then disregard it from then on (I cannot easily see it as my ScanGauge E sits in front of it). Reading L/100km doesn't make for a very accurate display. Yours says 8L/100km whereas mine says 62.4 mpg. A tiny change on mine is displayed.
Best thing is just to do the calculations at top up time. Use Fuelly.com or the like.

(https://i.imgur.com/qV2N6DN.jpg?1)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 07:54:25 AM


Wouldn't engine braking using the paddles in the CVT add undue wear on the gearbox?
Don't see how. No difference in accelerating or engine braking forces on the CVT, the steel belt is a push type.

I'm assuming not more wear than acceleration but still wear none the less?

Much cheaper to replace brake pads than eventually opening the gearbox.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 08:00:52 AM
I just reset the "Fibometer" at top-up time, then disregard it from then on (I cannot easily see it as my ScanGauge E sits in front of it). Reading L/100km doesn't make for a very accurate display. Yours says 8L/100km whereas mine says 62.4 mpg. A tiny change on mine is displayed.
Best thing is just to do the calculations at top up time. Use Fuelly.com or the like.

(https://i.imgur.com/qV2N6DN.jpg?1)
I do use fuelly but I was just wondering if the average shown by the onboard computer is typically pretty far off?

The onboard instantaneous economy meter seems to show 5L/100km when I expect it to.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 03, 2020, 08:35:12 AM
My average is 5.1L/100km (calculated) but what I was getting at is the lack of accuracy working in L/100km against mpg, just because it is a smaller figure. My "Fibometer" registers to 0.1 up to 100 mpg then in units of 1 after that.
I know that because I filled up once at the filling station at the top of the town one quiet morning and by the time I had reached home (almost all downhill) it was reading 102 mpg.
Does your display read to two decimal places?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 08:49:23 AM
No just to one decimal point. But whether the display shows mpg vs L/100km should have little consequence, the computer is doing the work so it could probably be told to show either without much hassle. It's just a direct conversion that is probably only done at the cluster depending on which region the vehicle was made for, the actual method for collecting the raw data is no doubt the same.

For instance I could have converted my reading to mpg before posting and you'd have been none the wiser.

I just checked now and my average is actually 7.2l 100km, a few decimal points out would be fine but I would expect mine on a 1.3 Cvt to be around 6L 100km.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 03, 2020, 10:26:26 AM
The method for gathering and processing the data will be the same no matter what the display is set to show. What I mean by the accuracy of the display is at 5L/100km you have to have a change of 2% before the decimal point clicks over. At 62.4 mpg a change of 0.2% causes the decimal point to change.
The display in L/Km may actually show closer proximity to the truth than the mpg display. You will know when you get your Fuelly figures how near to the truth it is.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 10:51:09 AM


The method for gathering and processing the data will be the same no matter what the display is set to show. What I mean by the accuracy of the display is at 5L/100km you have to have a change of 2% before the decimal point clicks over. At 62.4 mpg a change of 0.2% causes the decimal point to change.
The display in L/Km may actually show closer proximity to the truth than the mpg display. You will know when you get your Fuelly figures how near to the truth it is.

Yes I see your point in regards to the relative accuracy.
 
How far from the Fuelly figures have you found your onboard computer to be?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 03, 2020, 02:55:55 PM
My last full top-up, on the 6th July, was 63.4 mpg on the "Fibometer" and 61.7 mpg on Fuelly (3.8L/100 km).
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 06:02:26 PM
My last full top-up, on the 6th July, was 63.4 mpg on the "Fibometer" and 61.7 mpg on Fuelly (3.8L/100 km).
What the hell!
That's incredible economy, well done, the onboard isn't too far off though, is yours manual or CVT?

A correction my average economy was actually showing 8.2L, I not sure where I got the 7L figure, that's what got me wondering because that's terrible economy.

The projected range left on the tank equals a roughly 6.2L/100km economy which is what I would expect.

Does the range calculation incl the reserve and I'm assuming the 42L fuel tank spec likewise includes the reserve?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 03, 2020, 07:00:38 PM
Mine is a manual with the Dual Spark 1.2 i-DSi engine. Pulls from 20 mph in 5th gear as long as you don't try to boot it.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 03, 2020, 07:13:14 PM
Jocko any ideas on how the range calculation works in terms of what it defines as the fuel tank size?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 03, 2020, 10:52:25 PM
My car doesn't have range left, though my ScanGauge does. I would imagine it will use the entire tank capacity including the reserve, but I would not take its range as gospel. If it overestimates the mpg, it will exaggerate the remaining range. I top up as soon as possible after the low fuel warning light comes on, but I know for a fact I have 40+ miles left.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 05, 2020, 05:40:37 PM
Jazzmeister. Just filled up again today and the "Fibometer" said 62.3 and Fuelly 60.6.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 05, 2020, 07:50:46 PM
Jazzmeister. Just filled up again today and the "Fibometer" said 62.3 and Fuelly 60.6.
Truly amazing and thanks for the update Jocko, what kind of terrain/traffic do you typically drive in?

I replaced my battery today and funny enough my average L/100km suddenly went to where I would assume it to be, around 6.5L/100km, for both the A and B odometer, the range of the remaining fuel fell though by a good 80km and I haven't driven more than 10km. The old battery was on it's last legs though so perhaps that had some influence on how to onboard computer or sensors function, possibly insufficient voltage to take an accurate reading.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 05, 2020, 08:58:58 PM
Jazzmeister: This short video shows typical driving for me. On the run videoed I actually achieved 108 mpg according to my ScanGauge E, which is more accurate than the onboard "Fibometer" (it uses the same data but there is a correction put in to the ScanGauge at every top-up). The rest of my driving is mainly motorway/dual carriageway with a smattering of town and city driving thrown in. On motorways I normally sit around 60 mph on the speedometer (55 - 56 mph on the GPS speedometer I have fitted).

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 05, 2020, 09:23:01 PM
Jazzmeister: This short video shows typical driving for me. On the run videoed I actually achieved 108 mpg according to my ScanGauge E, which is more accurate than the onboard "Fibometer" (it uses the same data but there is a correction put in to the ScanGauge at every top-up). The rest of my driving is mainly motorway/dual carriageway with a smattering of town and city driving thrown in. On motorways I normally sit around 60 mph on the speedometer (55 - 56 mph on the GPS speedometer I have fitted).

Those are great road conditions to get good fuel economy, that's if you put the effort in, nice scenery as well!

Any thoughts on why my averages would change so drastically with a fresh battery fitted, the distances hadn't been lost?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 05, 2020, 10:43:18 PM
Sorry I cannot help you there. Wait and see what Fuelly comes back with.

I do put effort into getting good mpg especially using Deceleration Fuel Cut Off.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 06, 2020, 12:47:44 AM


Sorry I cannot help you there. Wait and see what Fuelly comes back with.

I do put effort into getting good mpg especially using Deceleration Fuel Cut Off.

Does that technique also work with the 2nd gen CVT transmission?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: equaliser on August 06, 2020, 09:36:57 AM
Any thoughts on why my averages would change so drastically with a fresh battery fitted, the distances hadn't been lost?

Probably because the alternator isn't continuously trying to top-up a faulty battery, less drag from the alternator, more mileage!
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: culzean on August 06, 2020, 10:03:37 AM
Any thoughts on why my averages would change so drastically with a fresh battery fitted, the distances hadn't been lost?

Probably because the alternator isn't continuously trying to top-up a faulty battery, less drag from the alternator, more mileage!

The power steering on the Jazz draws around 60 amps,  if the battery cannot supply it the alternator has to ( the alternator does ultimately supply all electrical power on a car, but the battery acts as a reservoir to help the alternator out in times of high demand ),  quite a few people on here have had power steering issues and some fault lights mysteriously cure themselves simply by fitting a new battery..
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on August 06, 2020, 10:39:33 AM
It works with any modern car. It is part of the emissions reduction system.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Westy36 on August 19, 2020, 03:02:19 PM
Over the first month of ownership and the 1000 miles covered, averaged 54.5mpg. Very happy with that figure, especialy given the amount the air con has been running. Mind you, I'm not the worlds fastest driver and Suffolk is fairly flat.

It'll be interesting to see what effect colder temperatures have on the MPG.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Martin Haworth on August 19, 2020, 10:44:20 PM
2 week holiday, fully laden, 3 bikes on roof.

1250 miles.

44.5 mpg

Shocking.

Anything over 60, the bikes were like parachutes.

But... we rode some great trails.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on August 23, 2020, 01:13:36 PM
2 week holiday, fully laden, 3 bikes on roof.

1250 miles.

44.5 mpg

Shocking.

Anything over 60, the bikes were like parachutes.

But... we rode some great trails.
That's amazing considering how loaded you were, what engine do you have and is it an auto or manual?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on September 09, 2020, 01:31:11 PM
Does having a non standard wheel/tyre size have any influence on the onboard computers calculations?
My tyre is a 185/65/15, which is a 2.1% larger circumference than stock 175/65/15
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: MPG_Junkie on October 18, 2020, 10:53:50 PM
I'm an MPG-Junkie and I am obsessed with monitoring MPGs. I've only had my current MK2 since 1st Oct and swapped the battery in the meantime, so I don't have any solid records yet. When I drove the car home after buying it, I scored 57 mpg mainly driving on the M25. Recently did only 48.6 but having swapped the battery it interfered with the reading. Also the tyres were underinflated. Will keep you updated. The MK1 which I sadly sold last week was doing 48mpg on tyres with C rating for fuel efficiency.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on October 19, 2020, 07:45:01 AM
Welcome, MPG Junkie. I too am obsessed with measuring and recording my mpg. I assume you calculate your mpg as the onboard display, known on this site as the "Fibometer", is notoriously optimistic.
As well as calculating and recording my mpg in a spreadsheet, I also use two online sites.
Spritmonitor.de (German site but with an English section as well), whose figure you can see beside my avatar. This figure is my average during my ownership of the car (currently approaching four and a half years).
The second site I use is Fuelly.com, and some of the other contributors here display their numbers beside their avatar.
Every time I top up, I switch off at the first click of the pump and input the litres used and the odometer reading, as well as calculating in my spreadsheet. (I know this is a bit CDO - OCD but in the correct order - but as you and I admit, we are junkies).
I also have a ScanGauge E fitted to my OBD II port, and this displays the instantaneous mpg (great for maximising DFCO) and the journey average. It can also do a hundred other things, as well as being a Code Reader and resetting tool.
The benefit of the ScanGauge over the "Fibometer" is the ScanGauge has a correction applied every time you top up and so returns a more accurate (though not perfect) mpg figure.

(https://i.imgur.com/qV2N6DN.jpg?1)
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: MPG_Junkie on October 19, 2020, 08:33:52 PM
Thanks for the info. What differences do you get between the onboard computer (whatever you call it) and the other methods that yo use?
I don't think I will be going in this territory of measuring it. I'm actually more into getting the best MPG I get. It is a form of an obsession really. What I like about the new MK2 I just bought 2 weeks ago is that it can display current fuel usage rather than watching the overall trip MPG al the time. It allows me to verify whether I should take my foot off the gas or not. It helps when I play loud music and can't hear the engine.
Today my MPGs are settling at something like 54.5 after 90 miles driven since last tank and air refuel combo.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on October 19, 2020, 09:07:33 PM
The biggest discrepancy I have experienced was the onboard display indicating 10% optimistic, but it is usually around 4% optimistic on my car. Other members have reported somewhere in between these two values.
The biggest improvements to mpg are seen when you make the most use of DFCO and anticipation. Every time you apply the brakes, you generate heat. This heat requires energy, and that energy comes from burning fuel. If you can anticipate when you may need to brake and lift off earlier instead, you will save a little fuel. And all these little savings soon add up.
I also do a bit of coasting when it is appropriate. On a long downhill, it can be possible to use DFCO and get (as the ScanGauge displays it), 9,999 mpg. I.e. no fuel being used. However, on a shallow downhill, DFCO causes the car to slow quickly, so I knock it out of gear and get 250 - 350 mpg. I never switch off the engine.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on October 20, 2020, 06:39:58 AM
My 2012 CVT is consistently averaging around 43mpg - Fuelly.
90% urban driving.. very hilly...

Tipped in a full bottle of injector cleaner last fillup (car has done 45k miles) and appear to be seeing slight improvement - maybe 1-2 mpg. But it will take 6 months to tell if a blip or not..
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: springswood on October 20, 2020, 08:13:18 AM
Thanks for the comments about how a new battery improves mpg. I realised I'd occasionally had heavy steering since I got my Jazz 2 years ago. Then last week it was reluctant to start for the first time ever. A new Yuasa 5054 from Tayna (more thanks) and it's parked up with the trip computer showing 60 something. Which is a first too.

I'm pretty obsessive about fuel consumption as well and use a cheap OBDII reader and Torque lite on my phone to help optimise my driving. Already I have noticed it is a lot easier to get good consumption at 30 on a level road. I think my alternator must have been working constantly. Now the engine is running as intended I'm interested to see what difference it makes. Of course it being a Mk1 I'll post that in another place.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on October 20, 2020, 08:34:23 AM
After your comments on the perceived improvement in mpg after fitting your new battery, I checked my figure. I don't have a lot of data as I had only had a couple of top-ups with the car before the battery failed, but there appears to be a 10% improvement in mpg after the new battery was fitted.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: JimSh on October 20, 2020, 08:56:46 AM
I suppose if the battery is not up to scratch, the alternator will be worked harder giving a reduction in mpg.

Edit
Oops. Just noticed Equaliser said the same thing a page ago.

Latest edit Added edit.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: springswood on October 20, 2020, 10:04:01 AM
It's complicated, there's a thread I can't find again that explained how the charging controller and ECU look at engine temperature, revs etc and if the load from the alternator would harm fuel consumption it lets the alternator spin freely, but only if the battery voltage is high enough.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: MPG_Junkie on October 20, 2020, 07:37:33 PM

The biggest improvements to mpg are seen when you make the most use of DFCO and anticipation.

I also do a bit of coasting when it is appropriate.


This is the first time I came across the term DFCO. This is one of the main things I do all the time. As long as there is nobody behind me pressurising me, when I see a red light I take the foot off and watch the light as I approach, instead of rushing to it only to stand there and having to move off from 0mph. MPGs alone, stopping and gaining speed from 0mph simply annoys me.

I used to do coasting a lot when I first bought my MK1 but I stopped this completely as I was worried that I was damaging my gearbox.

I know a lot of people will try to get best possible fuel efficiency in order to save money. Which is a bonus but to be honest I can afford the petrol I burn. This has simply turned into an obsession and a bit of a "game". I can't see myself quitting this any time soon. Unless my car was able to deliver consistent 55 MPGs effortlessly.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on October 20, 2020, 08:14:34 PM
I can afford the petrol I burn. This has simply turned into an obsession and a bit of a "game".
This is exactly the same as me. I regularly use a longer route to return from my son's as it returns better mpg. The short route burns less petrol but doesn't return such good numbers. One 6.3 mile section has returned 108 mpg from one end to the other.

Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: peteo48 on October 21, 2020, 10:44:23 AM
I can relate to the "obssession" as well. One of the joys of Fuelly.com is the plethora of pie charts and graphs. I love a good pie chart :D
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Sjazzy18 on October 21, 2020, 07:50:17 PM
Depends who drives. Motorway with me driving using cruise control and a bit of patience 55 - 60. My wife usually is less being a bit impatient & doesn't use the cruise control so will manage 55 or less. Round town stop start 45-50. We don't worry about it, just put more in.
 
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: springswood on October 22, 2020, 07:11:11 AM
I too love a good pie chart. One of my favourite facts is they were invented by Florence Nightingale. She wasn't particularly the figure of womanly virtue suggested by 'the lady with the lamp', she was a first rate statistician who developed a pie chart to show the powers that be what an horrendous proportion of the soldiers in the Crimean war were dying in hospital from poor hygiene.

My second favourite was the one on the loyalty card from the Pie and Mash shop in Skipton. Real attention to detail and their pies were fantastic. Sadly it closed recently, presumably they retired. I wonder if they bought a Jazz...
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on November 04, 2020, 01:33:43 PM


My 2012 CVT is consistently averaging around 43mpg - Fuelly.
90% urban driving.. very hilly...

Tipped in a full bottle of injector cleaner last fillup (car has done 45k miles) and appear to be seeing slight improvement - maybe 1-2 mpg. But it will take 6 months to tell if a blip or not..

That's mighty impressive, my 2012 CVT gets around 30-35mpg in urban driving, not sure what I'm doing wrong because I take it easy and the revs virtually never go over 2000rpm and hover somewhere between 1200-1400rpm.

Can you please explain how you drive your CVT for best fuel economy, say from pull off to the next traffic light stop?
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jocko on November 04, 2020, 01:47:28 PM
Can you please explain how you drive your CVT for best fuel economy, say from pull off to the next traffic light stop?
I don't have a CVT but I have had other autos for 25 years. If you have to use more than a little brakes to stop at the next set of lights you are using fuel you don't need to. The secret of fuel-efficient driving is anticipation which means leaving a bigger gap between yourself and the vehicle in front. Lift off the throttle early to allow your car to slow down instead of driving up to the light then having to brake. The heat that is generated by braking can only come from one place. The petrol you have burnt getting up to the speed you are trying to reduce.
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: madasafish on November 04, 2020, 06:31:26 PM


My 2012 CVT is consistently averaging around 43mpg - Fuelly.
90% urban driving.. very hilly...

Tipped in a full bottle of injector cleaner last fillup (car has done 45k miles) and appear to be seeing slight improvement - maybe 1-2 mpg. But it will take 6 months to tell if a blip or not..

That's mighty impressive, my 2012 CVT gets around 30-35mpg in urban driving, not sure what I'm doing wrong because I take it easy and the revs virtually never go over 2000rpm and hover somewhere between 1200-1400rpm.

Can you please explain how you drive your CVT for best fuel economy, say from pull off to the next traffic light stop?

First of all I diy service.
Car is standard but all brakes work without ANY dragging, the wheel bearings are OK, the oil and filter are changed every year AND the air filter is clean. Tyres pressures checked weekly

These are all essentials. Car has done 45k miles. Used on long 100+miles motorway journey twice a year, No other motorway travel. Michelin Cross Climate tyres with 15k miles on ..

We live on a 2km  long  hill which rises 200 meters. We are 400 meters along it from the bottom at approx 40 meters height. A 30mph limit but impossible to drive further up faster than an average 25mph (Very twisty with blind corners - lots of crashes (including a Defender half way up a tree)

Starting from cold:
 MPG from display

Going uphill : after 1 mile (at top hill), engine light went out after 500meters . 15mpg on display
Going downhill: after 1 mile - downhill then flat engine light still blue
I drive out of our gates and go downhill with a cold engine After 2kms of driving on the flat, engine temperature light still blue.  34mpg on display.

I usually go downhill  as it is fastest way to shops.
All my journeys  are 30mph limits except a 3 miles section dual carriageway which is 50/60mph.

I tend to drive outside rush hour.
I accelerate gently. Roads are hilly so coast down hill at 30mph with minimal throttle.  Accelerate as little as possible uphill consistent with doing 30mph (I do not dawdle)
I anticipate traffic lights. And roundabouts. I only stop when I have to - especially roundabouts.. I slow down but if clear do not go below 25mph.

I do not brake hard except in emergencies or nutters deciding to change direction without warning.(35-40k miles from front pads).

On flats I try to drive with Economy light (green) showing. 
As it's a CVT gearchanges are imperceptible so I try to drive as smoothly as possible - like a chauffeur.
When I park, all manoeuvering done when engine is warm (when I arrive) so less moving when leaving (engine cold).
When engine is cold .. and blue light on, rich fuel mixture so minimise acceleration - except when leaving drive as blind exit.


No tail gating .. too risky and too much braking.

On fast roads use lorry slipstreams to help acceleration.
Calculate mpg each tankful using Fuelly  so much more accurate than display. So any changes noted . Sudden drops could be cold weather or a fault.


And every month use 3,000 too 5,000 rpm for at least 5 miles on dual carriageway to clean engine and  (original ) plugs..
Standard Sainsbury 95 octane petrol.

If I just drive around town with no dual carriageway driving deduct 3-6 mpg.
If its is rain and and windy -2mpg

I averaged 36mpg one tank when we had half a meter of snow in 2013.(not fun on Dunlop Energy Savers on hills)


My Fuelly name is madasafish 42.8mpg over 8 years. Fuelly.com
Title: Re: What MPG are you getting from your Honda Jazz ?
Post by: Jazzmeister on November 07, 2020, 07:13:33 PM
Thanks for the in depth break down Madasafish