The 2020 Bentley Mulsanne is available as a 4-door, 5-seat sedan. Starting at $310,800, the 2020 Bentley Mulsanne Base is powered by a 6.8L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 10-mpg in the city and 16-mpg on the highway. The top of the line 2020 Bentley Mulsanne Speed, priced at $342,300, is powered by a 6.8L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 10-mpg in the city and 16-mpg on the highway.