badmyan

Greenie, I'ld also like to point out that durring the week, it's my wife's doing the driving

badmyan

Yep, on the open road it's vey good mpg. 100% the Audi 4.2 is awesome.

audivotary

dash display mileage computed by the car. I think the most accurate way is to consistently fill up the tank and divide miles driven by gallons used. Over time that should give an accurate picture. I only get 10mpg in San Francisco city driving. The only consistent long highway trips have been to Lake Tahoe at 17-18mpg, and may not be a fair test due to the up and down driving in the mountains. I love the car (2001 A8L), but wonder if I should be getting better mileage. Would any malfunctions causing fuel inefficiency show up with the MIL, or check engine light?

mister dr

The dash display is waaaay optimistic.

I used to average 19.2mpg, but recently started adding toluene to the tank to increase octane. The car now runs really really well (like an even-more-scalded cat!) but since the engine is now able to pump more air it's also using more gas...the gas mileage has dropped to about 17.5mpg.

I do a lot of highway driving, and the car stays above 5000ft. elevation, so for people who do some city driving at sealevel, 10mpg sounds reasonable to me for these cars.

D3AeighT

The trip computer and "manual method" - miles driven / gallons....is one in the same for me.

greenie

Ah ha!!!!