The 2020 Mercedes-Benz GLB 250 is available as a 4-door, 5-seat sport utility. Starting at $36,600, the 2020 Mercedes-Benz GLB 250 FWD is powered by a 2.0LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 30-mpg on the highway. The top of the line 2020Mercedes-BenzGLB 250AWD , priced at $ 38,600 , is powered by a 2.0LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway.