The 2020 BMW M340 is available as a 4-door, 5-seat sedan. Starting at $54,000, the 2020 BMW M340 RWD Base is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway. The top of the line 2020 BMW M340 AWD, priced at $56,000, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway.