The 2010 BMW 328 is available as a 4-door, 5-seat sedan. Starting at $36,200, the 2010 BMW 328 RWD Coupe is powered by a 3.0L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway. The top of the line 2010BMW328w/SULEV RWD Convertible , priced at $ 45,000 , 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 26-mpg on the highway.