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 3.2LL , 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 2007AudiA64.2 quattro Sedan , priced at $ 55,300 , is powered by a 4.2LL , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway.