The 2018 BMW M3 is available as a 4-door, 5-seat sedan. Starting at $66,500, the 2018 BMW M3 Base (M6) is powered by a 3.0L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2018 BMW M3 CS, priced at $98,250, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.