The 2009 BMW M6 is available as a 2-door, 4-seat coupe. Starting at $107,900, the 2009 BMW M6 Convertible is powered by a 5.0L, 10-cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 17-mpg on the highway. The top of the line 2009 BMW M6 Coupe, priced at $102,100, is powered by a 5.0L, 10-cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 17-mpg on the highway.