What MPG are you getting from your Mk1 Honda Jazz ?

[springswood]

Topped up today and the last 350 very mixed miles averaged 54.8 mpg. Very pleased with that  . Hopefully it was the cat cleaner what did it. I did have to replace the back box too. Could the old one have been obstructing the flow?  Of course it could be a duff pump which cut out too soon I suppose.
All this on whatever supermarket petrol is cheapest. Usually Asda, today Sainsburys.

[Jocko]

I also use supermarket fuel. Never found and advantage not to.

[springswood]

I should have said the reason I'm not sure about the figure of 54 odd mpg is that the dash only showed 45.1. Has anyone ever had the dash display be pessimistic?

[Jocko]

Has anyone ever had the dash display be pessimistic?

Since I started recording the display against the actual (coming up for a year) I have had two pessimistic readings. In both instances they were for actual values better than 60 mpg. Perhaps the error is on a sliding scale, with more optimistic readings at lower actual values and more accurate and ultimately pessimistic read outs for higher actual values (I have had the display and actual value match once, at 57.1 mpg).

[springswood]

Thanks. I'll know for sure when I next top up. Which might be a while 

[peteo48]

I also use supermarket fuel. Never found and advantage not to.

I'm on my second tank of Irish petrol (Apple Green) - sold from their own forecourts and catering outlets. Supermarket prices and no performance issues at all.

[Jocko]

Yesterday, on my way into Edinburgh city centre, I spent 10 miles on busy single carriageway roads stuck behind an articulated aggregate truck. It kept a constant 35 - 40 mph as, with no chance to overtake, did I. My ScanGauge showed me averaging better than 60 mpg! Unfortunately, an hour in crawling evening rush hour traffic, on my return, robbed me of any benefit from my outward journey.

[springswood]

The 54+ mpg figure was down to the pump cutting off early.

[Jocko]

That is why the average over a spell is better. I log my fuel usage here: www.spritmonitor.de/ (there is an English option) and the number below my avatar is my running average over my life with the car (approaching 3 years).

[springswood]

Thanks. I've been using fuelly which shows an average of 42.1 since last October. Which is quite good amongst the figures there.  - though they do vary a great deal.

[Eddie Honda]

Haven't been on for ages, but FWIW the 2005 Jazz is doing okay on the fuel at around 123k now. (bought at 68k)

Average on the left is 43.0 mpg which is mostly wifey's doing. I rarely drive the thing and whilst I record everything going in and out the mpg is reflective of average conditions/driving/use (including the odd roofbox/trailer runs) rather than economy driving - I'm more interested in what it costs per mile/km to run and how long various parts last.

[Jocko]

Thanks. I've been using fuelly which shows an average of 42.1 since last October.

I use Fuelly as well. Gives lots of good statistics.

[Jocko]

Topped up with fuel this morning and collected my ScanGauge data for the tank, as I normally do. One of the parameters it stores is the hours driven, and it is quite scary to see that every tankful of petrol used involves me driving for 13 - 14 hours. As I usually fill up once a fortnight this equates to around a solid fortnight of my life, every year, driving my car. Just as well I love driving.
Owing to medical issues, today is my wife's last day at work for the next month or so. It will be interesting to see how my numbers change without my daily drop off and pick up. Mind you, I tend to get good figures for these trips (especially the early morning one), so I might even see a deterioration in mpg over the near future.

[Jocko]

Yesterday, I had a medical emergency which required a dash over to the south of Edinburgh. Despite 80+ mph (50 mph average), loads of acceleration and brakes instead of lifting off, the ScanGauge still showed 50 mpg for the trip.
Today I filled up the near empty tank (not quite my usual top up but in preparation for hospital visits) and the calculated mpg was 57.5 for 383 miles.

[Jocko]

Yesterday afternoon I had a trip back from hospital, in Edinburgh, just as the evening rush hour started. I had crawling traffic right to the outskirts of the city, then a three mile queue onto the Queensferry Crossing. My Scan Gauge showed my average mpg as less than 45. And that included the faster bits elsewhere on the journey. I feel sorry for drivers who experience that on a daily basis. An ideal daily journey for an electric vehicle.