The 2010 BMW M3 is available as a 4-door, 5-seat sedan. Starting at $58,400, the 2010 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 2010 BMW M3 Convertible, priced at $67,050, 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.