The 2016 Bentley Mulsanne is available as a 4-door, 5-seat sedan. Starting at $303,700, the 2016 Bentley Mulsanne Base is powered by a 6.8L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 18-mpg on the highway. The top of the line 2016BentleyMulsanneSpeed , priced at $ 335,600 , is powered by a 6.8L , 8 - cylinder engine that returns an EPA estimated 11-mpg in the city and 18-mpg on the highway.