russ0054

I now have 6000 miles on my Q5 with 2.0T engine and have noticed what appears to be a rather large disparity between what the computer reports for gas mileage and what I calulate using the gas pumped/mileage method.

The car computer indicates I am getting between 26 and 29 MPG on the freeway, however when I check at the fill up mileage is up to 4 MPG less.

Anyone else experiencing a wildly over-optimistic computer?

stevedusa

I think it varies depends on your driving style. Mine is about 1-1.5 MPG lower across the board according to my own calculations.

springsteen

Mine runs between 1.5-2.0 miles under what the computer posts--almost 5,000 miles logged.

rumon

+1 (after 2500 miles)

claud

around 2 mpg optomistic. It pissed me off at first , then I realized I was getting 2-3 mpg better than our old 07 X3.

john1r

I did a long drive from NY to DC a few weeks ago and computer said I got 27 MPG, but I really got 23.

uberwgn

Very common, Russ. If you find someone with the VCDS tool, they can fine-tune the reading for you. I've got mine tweaked so it's typically +/- .3 mpg around the city. It still reads too high on long trips but I have it set to what I believe is my best scenario.

IIRC, I moved my setting from "100" up to "109" and that puts me in the ball park.

JohnBoyToo

There are SO many variables that I take the indicated mpg as just a 'suggestion'

Many mfg's mpg calcs are usually optimistic !
(is that a sales technique for the test drive ?!? I wonder ?!?)

Also, between mfg's, some use different ways to calculate...

some use injector cycles, some use fuel metering, some use tire rotation, some have just guesstimates...

UrbanExtant

For anyone with a VAG cable, there are instructions on the internet how to adjust the equation used to calculate the MPG by the car, so it will reflect what one gets through actual calculation.

EDIT: Here's the link

http://www.audienthusiasts.com/VagComDIS.html