The 2012 Mercedes-Benz C-Class is available as a 4-door, 5-seat sedan. Starting at $40,575, the 2012 Mercedes-Benz C-Class C 350 RWD Sedan is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 2012Mercedes-BenzC-ClassC 350 AWD 4MATIC Coupe , priced at $ 44,370 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 28-mpg on the highway.