The 2013 Mercedes-Benz GL-Class is available as a 4-door, 7-seat sport utility. Starting at $63,900, the 2013 Mercedes-Benz GL-Class GL 450 is powered by a 4.7L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 19-mpg on the highway. The top of the line 2013 Mercedes-Benz GL-Class GL 63 AMG, priced at $116,925, is powered by a 5.5L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 17-mpg on the highway.