Anyone else with an A8 like to share their GAS mileage. Amazingly, my new A8 seems to better the mileage I used to get with the 97 A4 2.8Q. After 2 weeks (~1700 miles) the A8 is getting an average of 22 MPG (combined City and Highway). It seems to get about 18 city and about 24 highway. This is with spirited 75+ MPH driving. I figure it will do better once the novelty wears off.

The 97 A4 was getting about 21 MPG average. I also have a 96 2.8Q that seems to get 22-23 MPG average (combined).

Given the 24 Gallon tank in the A8, I love the almost 400 mile range. I used to fill-up twice per week with the A4s with the daily commute - the A8 needs only 1 trip to the gas station.

I think the EPA numbers are 17 city /25 hwy for the A8 4.2 quattro. This is remarkable when you compare them to the numbers for the much smaller A4 2.8 quattro/Tiptronic (17/27). The light weight of the A8 pays off nicely in performance and fuel economy.

I wonder if it is not that the A8 is so light, but that the A4 and A6 are really that heavy. At 3400-3600 pounds - the A4 is not exactly lightweight. When you consider that bigger sedans like Camry's and Maxima's weight less than the smaller A4 (by about 200-300 pounds), I think that tells a lot about the gas mileage.

On the other hand, when you consider that the A8 is only 400 lbs heavier than the A4 - that is amazing.

The old S-class was over 4500 lbs, and the current 740i weighs over 4200 lbs. Compared to those cars, the A8 is light, especially when you consider the weight penalty imposed by quattro. The 2000 A8 is yet another 100 lbs or so lighter than before with additional use of aluminum in the suspension components.

I have a '97 A8 4.2 (US model) and that seems to be the kind of milage I am getting (21-22 mpg combined). I live in a small town in a rural area so most of my miles are driven on highways. I did a quick test with the on board computer one day which reported 25.5 mpg on the highway portion of my drive home from work but I just bought the car two weeks ago and have not taken it on any long highway drives so I have no way to confirm the number the computer gave me yet, I am only on my second tank of gas. I reset the average mpg on the computer just before the last fill up so I can confirm numbers when this tank is drained.