The 2021 Mercedes-Benz AMG GLA 45 is available as a 4-door, 5-seat sport utility. Starting at $54,500, the 2021 Mercedes-Benz AMG GLA 45 Base is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2021Mercedes-BenzAMG GLA 45AMG GLA 45 AWD , priced at $ 54,500 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.