The 2006 BMW 650 is available as a 2-door, 4-seat coupe. Starting at $78,800, the 2006 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 22-mpg on the highway. The top of the line 2006 BMW 650 Coupe, priced at $71,800, 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 23-mpg on the highway.