Trip computer mpg accurate?

Lukie761 · Post by **Lukie761** » Wed Feb 22, 2017 4:28 pm

Hi guys,

Been driving my coupé for a couple of weeks now, and wherever i go whether it be town or dual carriageways, i've never found my mpg go above 23!

I obviously didn't buy the car for its 'sheer economical performance' but i was purely interested in what everyone else is getting around town for 10 mile drives etc...

Thanks in advance

Roundozo · Post by **Roundozo** » Wed Feb 22, 2017 4:32 pm

Fill it up, reset the trip computer and drive around. It should then give you an average. They're not very accurate though so bear that in mind. Also who cares! It's putting a smile on your face and that's all that matters!

mmm-five · Post by **mmm-five** » Wed Feb 22, 2017 4:40 pm

Short runs from cold will always ruin the consumption.

For my Z4M...10 miles of London stop-start and I get about 17mpg - only just more than I get at the Nurburgring.

On a run it's close to 30mpg.

Lukie761 · Post by **Lukie761** » Wed Feb 22, 2017 4:50 pm

Cheers for that guys, it was purely out of interest as obviously you see people claiming to get 30mpg out of these with short drives round town and a roads etc...

buzyg · Post by **buzyg** » Wed Feb 22, 2017 4:53 pm

mmm-five wrote:Short runs from cold will always ruin the consumption.

For my Z4M...10 miles of London stop-start and I get about 17mpg - only just more than I get at the Nurburgring.

On a run it's close to 30mpg.

17mpg at Nurburgring.

Marlon · Post by **Marlon** » Wed Feb 22, 2017 4:54 pm

Yeah, short commutes will give you low 20's - get it out on a long run on A roads and M-ways and you should average 28-30 mpg. Steady driving on an m-way can attain mpg figures into the 40's

BradleyB · Post by **BradleyB** » Wed Feb 22, 2017 5:03 pm

Yeah reset it! I reset the mpg every time I fill up and put the mileage, fuel price and litres into an app on my iPhone. I then compare the figures and the car always seems to calculate a bit higher than what I'm actually getting!

Smartbear · Post by **Smartbear** » Wed Feb 22, 2017 5:26 pm

Hi, whens the last time you reset the mpg computer Luke? Your figure may be a very long term average, hence you not seeing any change

Rob

mmm-five · Post by **mmm-five** » Wed Feb 22, 2017 5:29 pm

buzyg wrote:17mpg at Nurburgring.

14mpg actually, which really pisses off my e34 M5 friends, as they're getting sub-10mpg

I'm not chasing times anymore, so change up no later than 7000rpm, and I'm not particularly slower than I was before. Traffic affects consistency more than my acceleration, and I even do an 'economy' challenge where you still have to be under 10 minutes but can use whatever gears/revs you like. Best was 20mpg in mine (before I took the Alfa JTD of course - that's about 35mpg when wringing its neck).

Chris_D · Post by **Chris_D** » Wed Feb 22, 2017 5:35 pm

Fuel economy? You all fail!

I fail at taking photos however, so it all balances out really

: image.jpeg (67.5 KiB) Viewed 1091 times

buzyg · Post by **buzyg** » Wed Feb 22, 2017 5:39 pm

mmm-five wrote:
buzyg wrote:17mpg at Nurburgring.
14mpg actually, which really pisses off my e34 M5 friends, as they're getting sub-10mpg

I'm not chasing times anymore, so change up no later than 7000rpm, and I'm not particularly slower than I was before. Traffic affects consistency more than my acceleration, and I even do an 'economy' challenge where you still have to be under 10 minutes but can use whatever gears/revs you like. Best was 20mpg in mine (before I took the Alfa JTD of course - that's about 35mpg when wringing its neck).

I was sub 10 mpg in the Fiat around the ring. Only done Spa in the Zed and didn't work out mpg properly. I was using all 8k for the first few laps, up the main straight, chasing a 996 porker turbo. Then I took pity and started changing into 5th. Still couldn't keep up with my mates 2ltr ford duratec lump though.

chapeau · Post by **chapeau** » Wed Feb 22, 2017 6:24 pm

My commute to and from work consists of a few miles of A road and the remainder is stop start due to the sheer number of traffic lights. It's a 13 mile journey and I average between 26-30mpg over the course of a tank of fuel in my 2.5i. The car usually overstates the mpg by about 1-2mpg I have found.

Marius · Post by **Marius** » Wed Feb 22, 2017 7:16 pm

buzyg wrote:
mmm-five wrote:Short runs from cold will always ruin the consumption.

For my Z4M...10 miles of London stop-start and I get about 17mpg - only just more than I get at the Nurburgring.

On a run it's close to 30mpg.
17mpg at Nurburgring.

That's probably takes 17min to do one lap, haha

Smartbear · Post by **Smartbear** » Wed Feb 22, 2017 7:18 pm

buzyg wrote:
mmm-five wrote:
buzyg wrote:17mpg at Nurburgring.
14mpg actually, which really pisses off my e34 M5 friends, as they're getting sub-10mpg

I'm not chasing times anymore, so change up no later than 7000rpm, and I'm not particularly slower than I was before. Traffic affects consistency more than my acceleration, and I even do an 'economy' challenge where you still have to be under 10 minutes but can use whatever gears/revs you like. Best was 20mpg in mine (before I took the Alfa JTD of course - that's about 35mpg when wringing its neck).

I was sub 10 mpg in the Fiat around the ring. Only done Spa in the Zed and didn't work out mpg properly. I was using all 8k for the first few laps, up the main straight, chasing a 996 porker turbo. Then I took pity and started changing into 5th. Still couldn't keep up with my mates 2ltr ford duratec lump though.

What was it in, a caterham 7?

Rob

step_change · Post by **step_change** » Wed Feb 22, 2017 8:19 pm

I get about 36 - 38 on a free flowing Motorway/A-road in my 2.5Si.

That drops to mid 20's in traffic.

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