The 2012 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $49,900, the 2012 Audi A6 Premium (Tiptronic) quattro Sedan is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 28-mpg on the highway. The top of the line 2012AudiA6(Multitronic) FrontTrak FrontTrak Sedan , priced at $ 41,700 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway.