One tire was out of round and replaced by the dealer.
Hit a pothole which bent 2 rims and ruined another tire, requiring replacement. Pirelli replaced the tire without charge.
Gas mileage is poor in mixed suburban driving, 14-15 mpg. Highway is better, about 21 mpg.
I have the 17inch wheel option, low profile tires. These are particularly susceptible to damage from potholes, since there is not much tire between the wheel and the ground. However the wide tires do contribute to the handling, so I would buy them again.
Aside from the gas mileage I have been very happy with the A6 Avant (wagon). It's smooth, comfortable, peppy, and handles like a true European sports sedan. There is lots of room with the rear seats down, and with the seats up, rear seat passengers find the ride very comfortable. The car looks good, draws favorable comments, even in a country where station wagons are considered dowdy and old fashioned.
The fact that Audi pays for all standard maintenance for 4 years is a major benefit, it is wonderful to bring the car in for service and pay nothing when I pick it up.
"in a country where station wagons are considered dowdy and old fashioned" > when petrol prices are through the roof you'll see a lot more people opting for roomy wagons over those unnecessary City-SUVs. And about time too. I mean, what's the point of having an Escalade or even a Montero say in downtown LA?!