The 2003 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $35,850, the 2003 Audi A6 FrontTrak FrontTrak Sedan is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway. The top of the line 2003 Audi A6 quattro Quattro Station Wagon, priced at $38,800, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway.