The 2010 BMW 650 is available as a 2-door, 4-seat coupe. Starting at $85,550, the 2010 BMW 650 Convertible is powered by a 4.8L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway. The top of the line 2010BMW650Coupe , priced at $ 78,450 , is powered by a 4.8L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway.