The 2007 BMW 650 is available as a 2-door, 4-seat coupe. Starting at $81,700, the 2007 BMW 650 Convertible is powered by a 4.8L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway. The top of the line 2007BMW650Coupe , priced at $ 74,700 , is powered by a 4.8L , 8 - cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.