The 2020 Mercedes-Benz AMG GT is available as a 2-door, 2-seat coupe. Starting at $115,900, the 2020 Mercedes-Benz AMG GT Base Coupe is powered by a 4.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway. The top of the line 2020Mercedes-BenzAMG GTR Roadster , priced at $ 189,750 , is powered by a 4.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.