Two Sedans with some similarities, but otherwise different in most aspects such as the modifications, starting price, fuel economy, horsepower, ground shadow size, and height. First of all, there is a notable difference in the starting price of the 2017 Jaguar XJ XJR LWB, which is $183,670 less than the base MSRP of the 2017 Bentley Mulsanne. Also, a bigger engine usually means less mpg. But the 2017 XJ XJR LWB has a more powerful engine and it gets 4.5 more mpg than the 2017 Mulsanne. In addition, the Mulsanne is both slightly larger and taller than the XJ XJR LWB. Among similarities are the body structure, market segment, and maximum occupancy.