The 2007 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $41,950, the 2007 Audi A6 FrontTrak FrontTrak Sedan is powered by a 3.1L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway. The top of the line 2007 Audi A6 4.2 quattro Sedan, priced at $55,300, is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway.