The 2009 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $50,100, the 2009 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 2009 Audi A6 4.2 Prestige quattro Sedan, priced at $60,950, is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway.