The 2011 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $50,200, the 2011 Audi A6 3.0 Premium quattro Sedan 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. The top of the line 2011 Audi A6 FrontTrak FrontTrak Sedan, priced at $45,200, is powered by a 3.2L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.