2002 Audi A6 4.2 quattro AWD 4dr Sedan (4.2L 8cyl 5A)
I use mainly for highway. I replaced air filter with K&N and new irridium plugs. I now get 26 to 28 mpg depending on whether I go 80 or 60 mph. I have had no problems and this car is built by the same people that make Porsche so everything is high performance, even the brake fluid. Thus more maintainance. It costs to go fast. I recently test drove a Mercedes S430 and as soon as I got back in my A6 4.2 it was far superior in road feel and handling. This is a double overhead cam V8 with 5 valves per cylinder. Ferrari is the only other car company with this sofistication. So if you want a mundane sedan this is not for you. This car is a race bred sedan down to the low profile tires.
Powertrain and handling. Exterior styling. Loaded with features.
High repair cost. But any high performance luxury sedan will cost more than a Ford or Chevy. Comes with the territory.