The 2021 BMW M850 is available as a 2-door, 4-seat coupe. Starting at $111,900, the 2021 BMW M850 Coupe is powered by a 4.4LL , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2021BMWM850Convertible , priced at $ 121,400 , is powered by a 4.4LL , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.