View Full Version : Real life mpg and what the computer tells you?

12-03-2007, 09:14 PM
Just wondering if you find that the computer is accurate or not?

Anyone got any figures?

12-03-2007, 11:43 PM
mine said i had 0 miles left in the tank.... but i still managed another 10 miles after TIBSHELF services on the M1 was closed for fuel.... not the best place to be at 11pm on the dark section of the M1 LOL!!

13-03-2007, 12:13 AM
Had mine drop from 25 to 0 miles to go as I sat in a queue.

However the average seems to be quite accurate.

13-03-2007, 01:41 AM
My Alfa 147 used to get 99mpg at times :confused:

13-03-2007, 09:30 AM
Mine is remarkably accurate. I have always thought my 2.4 should do more to the gallon so I have tested it out a bit.

When on petrol I averaged 24.7 on the computer and it turned out to be 24.4 when working it out from fuel used.

On LPG, it is 18.6 (gulp) and 18.9 in real life. (I can get LPG for 39.9p litre)

So, it is accurate enough for me, even on LPG.

13-03-2007, 10:56 AM
I can get at least another 30miles on "0 miles to empty" but I wouldn't recommend it - your fuel pump is sucking harder with no petrol to keep it cool.

The average is quite good, the instantaneous is only good on long, constant speed runs and the miles to empty is sketchy.

13-03-2007, 11:39 AM
im not sure about mine :( seems to be roughly accurate, tends to show an average of around 35mpg when doing around town, but in reality, i tend to get around 45mpg, not sure what that means:( but my motorway run to preston and back on saturday, was further out, stating 53.5mpg, im sure i got mroe than that :confused: