The 2011 BMW M3 is available as a 4-door, 5-seat sedan. Starting at $58,900, the 2011 BMW M3 Coupe is powered by a 4.0L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2011BMWM3Convertible , priced at $ 67,550 , is powered by a 4.0L , 8 - cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 20-mpg on the highway.