What MPG are you getting from your Mk1 Honda Jazz ?

[RichardA]

Posts regarding 1930 Morris Minor chassis moved to here:
https://clubjazz.org/forum/index.php?topic=13306.0

All other off-topic posts removed.

[Jocko]

Today I had to top-up the tank again and I was not expecting a great number. We have a builder doing work at the new house and when he finishes, and we set off for home, we are right in the evening rush hour. However, for the past 430 miles and 7 and a smidge gallon, I have averaged 60.0 mpg. I can only put it down to the lovely warm dry weather.

[peteo48]

Great figures as always - MK4 economy from a MK1.

PS

Wonder if you could get three figures mpg out of a MK4?

[nowster]

Wonder if you could get three figures mpg out of a MK4?

Very possibly. I've had it report 85mpg on a 5 mile trip that was mostly 30-40mph.

[Jocko]

Figures for a 5 mile trip are meaningless. First off, the display is optimistic and the terrain plays a huge part. I have recorded 108 mpg for a 6 mile trip using my Scangauge. Only real test is top up to top up and even then several are needed for an accurate figure.

[Bazzzer]

I actually had my Mk3 showing 199.9 mpg the other day.  Perhaps that's as high as it goes.

I'd started from a car park at approx 500' up and, after initial acceleration, trundled down to a crossroads 1.4miles away at 150'.  There was a car in front, so I couldn't have gone much faster if I'd tried.

As I approached the bottom, I saw 172.8, 187.2 and finally 199.9 mpg.

[nowster]

Figures for a 5 mile trip are meaningless. First off, the display is optimistic and the terrain plays a huge part. I have recorded 108 mpg for a 6 mile trip using my Scangauge. Only real test is top up to top up and even then several are needed for an accurate figure.

Very true. I'm recording my fills in an app on my phone. I've only filled up twice so far, so only have one measurement to go by. (The initial fill from the dealership doesn't count.)

[Jocko]

I use Fuelly.com and here is my dashboard image with my last 10 top-ups.

[KJazz]

54 last time I looked on my 2003 Jazz, mixed town and motorway driving. Great machine.

[DomnicZZ]

Got my best tank to date. 57.7 (60.3 Fibo) that’s about 450 miles for 35 litres, which I found to be quite good for a 1.4 CVT auto.

The warm weather and longer trips is what contributed to it. Fuelly is certainly a very handy way to keep track. I avoid going above 60 MPH and manually switch off at long red signals.

[Jocko]

I avoid going above 60 MPH and manually switch off at long red signals.

That is certainly the way to do it. And try and use anticipation instead of the brakes!
I have a ScanGauge E fitted to my OBD2 port and it is very helpful.

[150234]

Interestingly, I also had slightly longer journey to make yesterday. However, it's safe to say I didn't do so well in terms of fuel economy. I average 39.2mpg over 101 miles of duel carriageway driving.

[springswood]

Here's my, much more average, summary from Fuelly.

Ignore the 61.7 mpg best figure. It's because I used a pump that must have filled the tank to the brim, it was over 100 miles before the needle moved off the end stop.

So although tank to tank gives an accurate long term figure the indicator on the dash is useful for comparisons and showing short term changes. Just this week I saw my figures for familiar journeys were dropping and I had a look at the air filter. Sure enough it needed changing.

[peteo48]

Here's my, much more average, summary from Fuelly.

Ignore the 61.7 mpg best figure. It's because I used a pump that must have filled the tank to the brim, it was over 100 miles before the needle moved off the end stop.

So although tank to tank gives an accurate long term figure the indicator on the dash is useful for comparisons and showing short term changes. Just this week I saw my figures for familiar journeys were dropping and I had a look at the air filter. Sure enough it needed changing.

I agree with what you say about the onboard computer - they do highlight short term changes and the indicator that shows mpg in real time is a useful tool for seeing what different throttle inputs do (I rarely use it myself however).

Over time my onboard computer is around 9% out (optimistic). Given the amount of short trips I make it's always somewhere in the 40s so if you knock off 4 mpg it gives me a figure that is as close to reality as makes no difference.

Still use Fuelly though.

[Jocko]

Today I topped up my tank for the second time this month and lo and behold, another penny on a litre. My low fuel light came on less than a mile from the filling station. The tank took 35.11 litres, the trip meter showed 492.6 miles since the last top-up, the fibometer said 65.8 mpg and Fuellly calculated it out at 63.7 mpg. You have got to love the summer weather, wet as it has been.