The 2018 BMW 340 is available as a 4-door, 5-seat sedan. Starting at $48,950, the 2018 BMW 340 RWD is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 32-mpg on the highway. The top of the line 2018BMW340w/South Africa AWD , priced at $ 50,950 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 31-mpg on the highway.