My wife and I drove from northern Georgia to New England on Sat and
Sun. 1100 miles, 16 hours driving time (17 hours timewise). I kept a
close eye on the mpg, and at one point, for about 100 miles, the A8L
got 30.2 mpg. I ended the 1100 miles trip with 29.1 mpg! Pretty good
for a car with a back seat as big as a pool room! The 8 speed xmsn and
reduction in weight are responsible for the good mileage.
The 372bhp engine also gave good performance. When I needed it, the
big white monster would giddy-up quite nicely. With massaging seats
(both driver/passenger), separate heat/cool controls, Serius radio, and
very good isolation from road noise, it was the easiest 1100 mile trip
we've ever taken. Although the A8L can not compare to the RS6 for pure
brute force, it handled the road very well, almost as good as the RS6,
but with a much more refined and comfortable ride.
Now I have to figure out how to get my mountain bike to Maine for
vacation. It's not going to fit in the trunk (it did on the RS6 with
the seats down). Maybe I can get it in the "pool room."