The 2018 Mercedes-Benz AMG G 63 is available as a 4-door, 5-seat sport utility. Starting at $142,800, the 2018 Mercedes-Benz AMG G 63 AMG G 63 is powered by a 5.5L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 15-mpg on the highway.