The 2011 Mercedes-Benz C-Class is available as a 4-door, 5-seat sedan. Starting at $39,990, the 2011 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 17-mpg in the city and 25-mpg on the highway. The top of the line 2011Mercedes-BenzC-ClassC 63 AMG RWD Sedan , priced at $ 58,200 , is powered by a 6.2L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 19-mpg on the highway.