The 2003 Mercedes-Benz M-Class is available as a 4-door, 5-seat sport utility. Starting at $36,600, the 2003 Mercedes-Benz M-Class Base is powered by a 3.2L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 19-mpg on the highway. The top of the line 2003 Mercedes-Benz M-Class Base, priced at $65,900, is powered by a 5.4L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 18-mpg on the highway.