The 2017 Mercedes-Benz G-Class is available as a 4-door, 5-seat sport utility. Starting at $122,400, the 2017 Mercedes-Benz G-Class G 550 is powered by a 4.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 14-mpg on the highway. The top of the line 2017Mercedes-BenzG-ClassG 550 4x4 Squared , priced at $ 225,000 , is powered by a 4.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 11-mpg on the highway.