Clubjazz - Honda Jazz & HR-V Forums
Honda Jazz Forums => Honda Jazz Mk2 2008-2015 => Hybrid Mk2 2011-2015 => Topic started by: guest3042 on June 18, 2012, 04:30:17 PM
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I had my first long trip in my Hybrid last weekend covering 460 miles return trip almost all on motorways, with three in the car, plus luggage and returned 62 mpg.
Delighted with that.
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Is the 62 mpg according to the computer or by refilling the fuel tank? The computer tends to be optimistic by a few mpg.
John
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The general thoughts are that the MPG read out is optimistic so use the refilling method to get an "accurate" measure.
But where does the distance come from for the calculation? The vehicle odometer? How accurate is that?
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The consumption was from the computer. Maybe not as good as I thought but I would still settle for a bit less.
Thanks for your replies.
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Hi All
If anybody is interested I am running an exel spreadsheet that easily works out the true mpg between fill ups using the A trip mileage (which automatically re-sets to 0 on refueling) and the amount of fuel input in litres.
I can't post the sheet on the forum but if anybody wants to try it, respond and it can be sent attached in separate e-mail
regards
Dave C
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Is it recommended to take the car out of ECO-Mode when one is travelling on the motorway?
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I think that eco mode saves fuel by slightly reducing the responsiveness during acceleration and won't affect motorway driving unless you like to do quick overtaking manoeuvres.
John
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OK. My wife who is a bit of a maths freak had the petrol receipts and mileage details and she worked out that the car did 61.2 mpg!!
That being the case the computer was close enough for me.
Thanks for all your interest.
Deva
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Intersting, My wife and I have recently had a couple of nights away in Warwick. Motorway and A roads plus a fair bit of town driving in Warwick and Stratford. Two up with luggage we averaged 61.2 mpg over 316 miles in our 2011 1.4ES manual. (whether you believe the trip computer or calculate manually, same result.)
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To keep it simple and easy I`m logging my fuel consumption here: http://www.fuelly.com/car/honda/jazz (http://www.fuelly.com/car/honda/jazz).
This is my car on Fuelly: http://www.fuelly.com/driver/dverez/jazz (http://www.fuelly.com/driver/dverez/jazz) ( I wish I had 6th gear...)
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Some of the mpg's reported by Jazz owners on Fuelly.com don't seem to be that good, but if they live in the city and/or only do short journeys you can't expect to much.
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Some of the mpg's reported by Jazz owners on Fuelly.com don't seem to be that good, but if they live in the city and/or only do short journeys you can't expect to much.
Also, by default, fuelly.com works in US gallons.
John
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I've been wondering why my Hybrid is giving a few mpg less this year than last and have to conclude that it's the probably down to the weather with far more driving in wind and rain. Rain and wet roads must add to the drag plus there's also the power used by headlights, wipers and often having the aircon running (for demisting).
John
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Haven't noticed a lot of activity about fuel consumption lately but I've been able to do a more accurate check now that we've logged a bit higher mileage.
At fuelling up yesterday we've used 48.05 gallons (218.45 litres) in our Hybrid from new and covered 3204 miles in that time.
That's using the mileage displayed but the fuel figures come from the fuel receipts on a tank to tank basis.
So, I make it 66.68 but that's in the north of Scotland with the wipers and lights on for most journeys and the aircon on most of the time.
Love the way this thing handles in snow though. Maybe the weight of the battery makes a difference but it's very predictable and better than most on traction, especially with a light right foot.
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At fuelling up yesterday we've used 48.05 gallons (218.45 litres) in our Hybrid from new and covered 3204 miles in that time. So, I make it 66.68 but that's in the north of Scotland with the wipers and lights on for most journeys and the aircon on most of the time.
Love the way this thing handles in snow though. Maybe the weight of the battery makes a difference but it's very predictable and better than most on traction, especially with a light right foot.
That's impressive MPG. I'm at 58.4 MPG (based on fuel receipts) despite driving with a very light right foot. Perhaps they have quietly updated the system software operating rules. How often do you see your battery depleting below half charge?
That's also good news about the handling in snow. The hybrid system should help providing controlled traction at low revs. Do you also use winter tyres?
John
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Hi all Hybrid owners
I continue to run my spreadsheet inputting fuel amounts and mileages between fill ups.
A lot of my journeys are I suppose relatively short (less than 10 miles) and I have noticed that the true mpg has plummeted during winter weather. I'm now experiencing low 50's versus the top end 50's during the hottest weather in the summer.
Overall I have now completed 8849 miles on 731.2 litres of petrol which equates to an overall 55 mpg, I also observe that the digital display optimistically always over states by about 4 mpg so its only relatively indicative and in no way should it be considered as accurate.
I think it would be useful if all folk can indicate the typical length and driving style of their journeys when quoting hybrid mpg as well as time of year. I had my car serviced in September (1st one) and allied to the colder weather the mpg fell from my best summer high of 63.4 to Winter worst of 47.8 .............and I am very light footed in ECO mode!
I can't wait for the warmer weather to come along,.......... written as I'm looking at the snow falling with 6 inches already down and Hybrid snugly parked in the garage..................roll on Summer!
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I always take mpg figures with a pinch of salt, knowing that manufactures achieve these figures on a rolling road.
Real world figures may not match the ones quoted, and there various factors like driving style, short runs, weight too much clutter in the car, tyres being underinflated, and others not mentioned like even the wrong tyres,
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My Hybrid has averaged 58.1 mpg over 6800 miles. I try to be very light-footed and always use ECO mode and tend to potter along the motorways in the low 60s conscious that the Jazz's spacious and good visibility cabin isn't very aerodynamic. Equally, I try to avoid short journeys unless absolutely necessary. I've got a long trip around Scotland scheduled for a month's time which contains a lot of the driving conditions where the hybrid system thrives.
John
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M.
Perhapsy sister in law has a honda jazz hybrid purchased new in september 2012.The car is driven carefully and has only done 700 miles so far but the fuel consumption is dissapointing at 42=43mpg= my own 2009 ex 1.4 i=shift which is briskly driven is returning as much.Perhaps the fuel consumption will improve as the miles mount?
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That is extraordinarily low for the hybrid and I would wonder whether the system is working properly. How is the mpg being measured (actual fuel and miles or computer (which is usually optimistic))?
We have another thread http://clubjazz.org/forum/index.php?topic=3019.msg20535#new (http://clubjazz.org/forum/index.php?topic=3019.msg20535#new) which specifically discusses the hybrid fuel consumption.
John
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Are you saying that this car has only done 700 miles in 7 months if so that is less than 2 tankfulls of petrol, I doubt if the engine has ever fully warmed up to obtain a proper working temperature let alone obtained maximum working efficiency, all factors that would affect fuel consumption.
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Although the car is not used very often, when it is used it does trips of 60 plus miles which include both A road and motorway running so I believe it will be properly warmed up.
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Is the mpg as indicated by the car's computer or calculated from fuel used?
If the latter then I would check the records of fuel bought and the calculation of mpg (note that an imperial gallon is 4.54609 litres - some calculators use the smaller US gallon which will give you more gallons).
The computer will give different mpg readouts for the A and B odometers. I reset my B odometer on each refill so I get a better indication of fuel consumption for the current driving conditions (my computer is typically 3mpg high).
The Jazz's high shape gives relatively poor aerodynamics so it's not ideal for motorway driving. Nonetheless, it should give 55 mpg at 70 mph unless there's also a 30 mph headwind.
I would suggest that the B odometer is reset at the start of the next 60 mile trip so the reported trip mpg can be observed. Depending on driving conditions it should be nearer 60 mpg than 50 mpg. If not, get Honda to check the car.
John
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sister in law has a honda jazz hybrid purchased new in september 2012.The car is driven carefully and has only done 700 miles so far but the fuel consumption is dissapointing at 42=43mpg= my own 2009 ex 1.4 i=shift which is briskly driven is returning as much.Perhaps the fuel consumption will improve as the miles mount?
the first question you know is gonna be asked is ' if the car has only done 700 miles in 8 months why bother with a hybrid anyway' - I would only have hybrid if I was going to do plenty of miles and could justify the extra cost of car against fuel savings (or lived in or had to travel into a congestion zone regularly), same with people who buy a diesel and only do low mileage (which is really bad for modern diesels with particulate filters).
another thing is, how does the battery keep it's charge if it is left for long periods without the engine running ? it may spend most of it's time recharging the battery and that won't help MPG.
Doing local mileage is never going to give you great fuel consumption, and what I have found with the MPG indication is that it is really sensitive to changes in driving style/conditions for first 50 miles and then (as it averages the present rate of consumption over more miles on the trip computer) it doesn't change anywhere near as quickly, and when you get over 200 miles on the trip the consumption figure hardly changes whether you are driving carefully or driving pretty briskly. That is why it is good advice to reset one of the trips every time you fill up ( personally i reset the 'A' trip and leave the B alone), then you can see quickly what effect different driving styles and conditions (temperature etc) have on the MPG. The truth is that most petrol cars only do about 25mpg until they reach operating temperature (Diesels are a bit better).
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Having had the hybrid car out for a .longish run last sunday, we have now discovered that it did in fact average between 55 and 60 mpg.The reason she bought the hybrid was her choice as she feels she is doing her bit for the environment,and also the cvt transmission.
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I've just exercised my Hybrid with an 11 day trip from southern England, around various parts of Scotland and home again. Perhaps 25% motorway and the balance mainly on A and B roads. 2155 miles and 162.47 litres = 60.3 mpg (the car's computer claimed 63.7 mpg - optimistic as always). I was hoping for better: A similar trip in August 2011 gave 65.8 mpg. On this occasion we had an extra passenger for about half the trip. I was beginning to think that the car (and/or battery) isn't operating as efficiently as when almost new although I have to wonder if the culprit is the wind which was noticeable and predominantly northerly. Heading up the M6 / M74 into the wind resulted in 55.3 mpg while the trip home worked out at 64.1 mpg. As I have previously hypothesised, a round trip with wind increases the fuel consumption since the aerodynamic drag is proportional to V squared.
Has anyone else got any updates on their Hybrid Jazz fuel consumption?
John
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could be temperature as it makes a big difference to mpg when it is cold (last August was probably at least 10 degree warmer than the cold May we had this year).
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I have just done 32 miles with the fuel range showing zero !
Then filled the tank with 33 litres >:(
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And the miles remaining shown by the computer is no better. it seems to do a decent job of the forecast until the tank is half empty but then swaps to another algorithm so it forecasts 0 miles remaining when the gauge shows empty. I think the handbook somewhere does state that empty = 7 litres remaining but it's annoyingly conservative given the good mpg but perhaps they assume that the driver will be stuck for several hours in a traffic crawl just when they plan to refill.
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My summer fuel consumption on regular petrol (shell) is pretty steady at 57mpg on the display. Tank to tank 55mpg is more accurate. Mainly 3 mile journeys in the country, with an occasional (once or twice a month) 40 mile journey. A little hilly, (Hampshire downs). Nearly 10mpg better than my previous regular Jazz for the same use - so about 15-20% improvement, which is at the top end of expectations, I think.
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I recently returned from another trip to and around Scotland. 1774 miles in total with 126.02 litres of standard unleaded to top up the tank which, by my reckoning, gives 64 mpg (the car's computer was around 68 mpg). Warm weather predominated but there was a particularly damp day in the north of Scotland which caused headlights and wipers to be on most of the time with the temperature at 11C.
One annoyance with my hybrid is that while going up a long hill it directly switches from assist to charge when it decides the battery is getting low (usually half charge). The loss of power is noticeable. I wonder why Honda didn't program the system to wait until the top of the hill (which would be indicated by a sustained easing off of the throttle) to trigger any charging.
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That is good going, can't grumble at mpg like that.
I think the programming is - protect the batteries at all cost. That is why the electric assist is a bit odd.
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That is good going, can't grumble at mpg like that.
I think the programming is - protect the batteries at all cost. That is why the electric assist is a bit odd.
Have you had all the software updates for the Jazz? In 2012 my 2010 Insight ES received 3 updates. One of the big differences is that it does postpone charging until the top of the hill if you keep the gas pedal pressed enough to maintain speed.
If you go by the car's gentle encouragement to drive economically (via keeping the coloured speedo green) it will allow charging uphill. The change from assist to charge is very gradual and controlled though. Before the updates it used to be rather abrupt.
Having seen the different behaviour, I think allowing charging uphill can be more fuel efficient in some circumstances. A higher SOC once you reach the top of a hill can mean gliding with fuel cutoff once you get onto the flat or downhill. It's akin to an assisted 'pulse and glide'.
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Have you had all the software updates for the Jazz? In 2012 my 2010 Insight ES received 3 updates. One of the big differences is that it does postpone charging until the top of the hill if you keep the gas pedal pressed enough to maintain speed.
If you go by the car's gentle encouragement to drive economically (via keeping the coloured speedo green) it will allow charging uphill. The change from assist to charge is very gradual and controlled though. Before the updates it used to be rather abrupt.
Everytime I have had the car serviced (by the Honda agent) I have asked them to check for software updates and they have always said that there are none available.
Given your comment about your Insight having 3 updates in 2012 I have to wonder whether my Honda agent didn't look very hard. It is difficult to believe that Honda would have fixed the Insight and not the Jazz since they are basically the same system.
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An update on my previous post: My local Honda agent have assured me that there are no service bulletins relating to software updates for the hybrid Jazz. Whether that means that nothing is available or people have to look somewhere else is another matter.