Author Topic: MPG for those interested.  (Read 172802 times)

peteo48

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Re: MPG for those interested.
« Reply #285 on: February 14, 2019, 04:25:46 PM »
I think it will get better, as Jocko implied, as the car settles in and the weather gets warmer.

Barky

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Re: MPG for those interested.
« Reply #286 on: February 14, 2019, 06:44:47 PM »
Getting an indicated 48.5 to 50 mpg on rural hilly roads on a 20 mile each way regular commute .... with a bit of careful driving & reaching flatter roads I'm sure 55 should be within easy reach  8)

andruec

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Re: MPG for those interested.
« Reply #287 on: February 14, 2019, 09:07:45 PM »
I don't often calculate it precisely but when filling up I expect better than 10:1 (miles:litres = 45mpg). So if I've driven 340 miles I expect to put a bit less than 34 litres in. So far I've always been better than 10:1.

Most of my driving is on main roads. My commute is 12 miles each way and includes a couple of miles in the evening that can be stop/start but mostly it's a steady 50mph. I also drive to local golf courses so that's mostly open road as well.

John Ratsey

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Re: MPG for those interested.
« Reply #288 on: February 15, 2019, 10:14:32 AM »
I do 50 miles a day to and from Edinburgh so the car gets pretty hot. The mpg figure is from the display. I never bother working the numbers out. I have to do the miles so I have to use the petrol and the dashboard display is near enough for my curiosity.
You might want to do some checks. I had a Mk. 3 Jazz for a year and the computer was 9% optimistic compared with the mpg calculated from fuel used and miles travelled. However, I don't recall any other Mk. 3 Jazz owners reporting similarly large discrepancies. However, the overall check compared with your previous car is whether the weekly fuel bill goes up or down (although the oscillations in the petrol price add some confusion to this approach).
2022 HR-V Elegance, previously 2020 Jazz Crosstar

mikebore

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Re: MPG for those interested.
« Reply #289 on: February 15, 2019, 11:38:14 AM »

I had a Mk. 3 Jazz for a year and the computer was 9% optimistic compared with the mpg calculated from fuel used and miles travelled. However, I don't recall any other Mk. 3 Jazz owners reporting similarly large discrepancies.

This is typical of my Mk3.

peteo48

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Re: MPG for those interested.
« Reply #290 on: February 15, 2019, 12:45:29 PM »
9% is about the discrepancy I've noticed over 2 Mk2 Jazzes and my current Mk3. It always seems to end up as about 4 mpg over optimistic. The only time it is more accurate in percentage terms is on long journeys so a recorded 60 will be an actual 56 but it's always 4 mpg!

Indeed, at the moment, the computer is showing 46.4 mpg over the 2500 or so miles since I've had the car and this is an actual 42.4 (see my avatar).

Downsizer

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Re: MPG for those interested.
« Reply #291 on: February 16, 2019, 03:43:45 PM »
I've just completed 3 years and 30636 miles, using 2738 litres of mainly ASDA 95, giving 50.9 mpg.  Trip B has been running throughout without resetting and is showing 55.8 mpg, a discrepancy of 9%.  Average speed shown as 35 mph.

peteo48

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Re: MPG for those interested.
« Reply #292 on: February 16, 2019, 03:59:26 PM »
I've just completed 3 years and 30636 miles, using 2738 litres of mainly ASDA 95, giving 50.9 mpg.  Trip B has been running throughout without resetting and is showing 55.8 mpg, a discrepancy of 9%.  Average speed shown as 35 mph.

Good figures. My average speed is 18 mph which accounts for my low mpg. I'm pretty sure I'd be in the 50 plus bracket if I was still doing my old 30 mile round trip commute to work.

Jocko

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Re: MPG for those interested.
« Reply #293 on: February 16, 2019, 04:07:08 PM »
Good numbers. Well done.

mikebore

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Re: MPG for those interested.
« Reply #294 on: February 16, 2019, 04:54:19 PM »
Fuelly is giving 46.0 avg for 37974 miles since I got the car new 32 months ago.

I haven't recorded average speed or the computer numbers but computer usually about 4mpg higher.

I am pretty sure that trip B reset every 10000 miles on my mark 2. Not bothered with it on mk3. Is your trip B showing the full 30636 miles?

Downsizer

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Re: MPG for those interested.
« Reply #295 on: February 16, 2019, 06:48:36 PM »
Fuelly is giving 46.0 avg for 37974 miles since I got the car new 32 months ago.

I haven't recorded average speed or the computer numbers but computer usually about 4mpg higher.

I am pretty sure that trip B reset every 10000 miles on my mark 2. Not bothered with it on mk3. Is your trip B showing the full 30636 miles?
No. Trip B has only 4 digits, but it seems that the average speed and fuel calculations continue unbroken.  I paid particular attention when it recently passed 9999 for the third time, and the averages didn't change.  Much of my driving is in East Anglia and north up the A1, which is all relatively flat.   No doubt this helps the fuel economy.  At the recent service, in a moment of weakness I was persuaded to pay £35 for a Tunap cleaner and additive treatment, but I'm not expecting any miraculous improvements!

mikebore

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Re: MPG for those interested.
« Reply #296 on: February 16, 2019, 07:10:37 PM »
Thanks! Useful to know that average speed and mpg of trip B do not reset.
Since I have never reset my trip B the mpg and speed should be correct data for my 38000 miles? Can't look at the moment

Jeangenie

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Re: MPG for those interested.
« Reply #297 on: February 20, 2019, 09:19:56 AM »
Last night's top up showed 41.1 mpg so a big improvement. I am happy with that. Next week my husband and I will be swapping cars so it will be interesting to see what sort of figure he gets.

Jocko

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Re: MPG for those interested.
« Reply #298 on: February 20, 2019, 09:29:34 AM »
That's better. If Bill is anything like his dad he will make a competition out of next week's figures! Willie was always very competitive.

mikebore

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Re: MPG for those interested.
« Reply #299 on: February 23, 2019, 07:28:34 AM »
Thanks! Useful to know that average speed and mpg of trip B do not reset.
Since I have never reset my trip B the mpg and speed should be correct data for my 38000 miles? Can't look at the moment

I have auto reset on tank fill set and it seems to reset B as well as A so I can't see my data for all 38000.

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