The 2022 BMW M8 is available as a 2-door, 4-seat coupe. Starting at $130,000, the 2022 BMW M8 Coupe is powered by a 4.4LL , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway. The top of the line 2022BMWM8Convertible , priced at $ 139,500 , is powered by a 4.4LL , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.