The 2009 Mercedes-Benz M-Class is available as a 4-door, 5-seat sport utility. Starting at $47,100, the 2009 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 15-mpg in the city and 20-mpg on the highway. The top of the line 2009Mercedes-BenzM-ClassML 350 4x2 , priced at $ 44,600 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway.