The 2015 BMW 640 Gran Coupe is available as a 4-door, 5-seat sedan. Starting at $78,300, the 2015 BMW 640 Gran Coupe RWD is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 31-mpg on the highway. The top of the line 2015 BMW 640 Gran Coupe AWD, priced at $81,300, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway.