The 2008 BMW 650 is available as a 2-door, 4-seat coupe. Starting at $83,700, the 2008 BMW 650 Convertible is powered by a 4.8L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 14-mpg in the city and 21-mpg on the highway. The top of the line 2008BMW650Coupe , priced at $ 76,600 , is powered by a 4.8L , 8 - cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway.