The 2014 Mercedes-Benz M-Class is available as a 4-door, 5-seat sport utility. Starting at $50,290, the 2014 Mercedes-Benz M-Class ML 350 AWD 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 22-mpg on the highway. The top of the line 2014Mercedes-BenzM-ClassML 350 BlueTEC AWD , priced at $ 51,790 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway.