M.p.g.

[Pistol Pete]

Hello, Hope everyone had a good weekend, fireworks and all that.
I picked up my trophy last weekend and put up the miles per gallon on the display, i then filled up the tank after forgetting to ask 4 a full tank in the deal(der). The mpg reading seems to just rise slowly since i filled the tank up.
Stating with 9 miles on the clock at about 12 mpg, now done 180 miles and 28mpg is this right or should it start from 0 mpg when you get in the car each morning or is it measuring the mpg for the whole tank of petrol as an average?

 

[Leeshez]

All i did was fill up then rest the computer. and i get about 34-36 MPG

 

[JBarber]

it works out a rolling average, so will likely vary a bit until you have a few miles under the belt. Pretty sure it describes the averaging method in the handbook.

 

[JBarber]

by "under the belt" I mean until you have done a few miles since resetting the computer.

 

[PYE21]

It works on an average, this means that you need around 300miles before it starts to read accurately.

 

[Pistol Pete]

cheers for that folks

 

[JBarber]

It works on an average, this means that you need around 300miles before it starts to read accurately.

300 miles? I think this figure is completely arbitrary (made-up!). It adjusts the average every 400 m so the distance you need to drive to get a stable average depends on the type of driving you do - but from my experience is more like 50-60 miles.

The trip computer is also a little optimistic too. If you work out the mpg by hand, it's usually less than the computer would have you believe (at least on mine it is!)

 

[rich_h]

The trip computer is also a little optimistic too. If you work out the mpg by hand, it's usually less than the computer would have you believe (at least on mine it is!)

I thought that too, my car works about 2 or 3 mpg higher than the actual consumption.

 

[ducks butts]

Driving at about 65 in the Trophy i get about 34.5 mpg, giving it some welly round the lanes i get about 27mpg. Some of the guys who have done track days have got it down to about 14mpg.