The 2008 BMW 328 is available as a 4-door, 5-seat sedan. Starting at $32,700, the 2008 BMW 328 RWD Sedan 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 2008BMW328w/SULEV RWD Convertible , priced at $ 43,500 , 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 27-mpg on the highway.