The 2016 BMW 428 is a 2-door, 4-seat Coupe, available in 5 trims, ranging from the (M6) RWD Coupe to the AWD Convertible. Upon introduction, the $41,850 (M6) RWD Coupe is equipped with a standard 2.0L, 4-cylinder, engine that achieves 22-mpg in the city and 34-mpg on the highway. a Manual transmission is standard. The $52,000 AWD Convertible is equipped with a standard 2.0L, 4-cylinder, engine that achieves 21-mpg in the city and 33-mpg on the highway. an Automatic transmission is standard.