My previous A6Q was a 1999 2.8 that could average
25.+ on trips & 21.5 in mixed city-hwy commuting.
I drove my present 2000 4.2 A6 on a 3000 mile trip
from N.Fla through west Pa & on to Northern Michigan.
The 4.2 averaged about 1/2 mpg better than my 2.8.
Both cars have had roughly the same mileage & service history;
both enjoyed only 93 octane fuel. I really didn't expect
the V8 to be quite so fuel efficient ...
Has anyone else observed this benefit with a 4.2 V8 ?

They have taller gearing though.

When I went to Mobil 1 0W30, it gets about 1/2 MPG better, when I got my superspring exhaust it got another 1/2 MPG better.

If I run my car with the A/C compressor off, I've been getting about 24.5 on the highway.

mostly stop light to stop light driving.

<center><img src="http://pictureposter.audiworld.com/3122/mpg.jpg"></center><p>
Chart shows average for each tankful over four years from new.

Spikes show road trips -- looks like I got to go on nine in the four years.

<center><img src="http://pictureposter.audiworld.com/3122/totalmpg.jpg"></center><p>
Chart shows the cumulative average tabulated every tankful over four years from new.

The average improved from low 16's to mid 17's over the first two years.

Current average is 17.3 MPG.

Steps show the influence of improved mileage from long road trips.

Switched from dino to Mobil-1 at 16K miles on August 29, 2001.

Man I gotta tell ya, the car looks absotutely f'ing awesome in that night time pic. Just gorgeous Kin!!!

pretty low to me even with SF's hills and my fairly quick driving.

aerodynamics, gearing, tires, etc.