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, the 2017 Jaguar XJ XJR LWB is priced $214,600 lower compared to the base MSRP of the 2017 Bentley Mulsanne Speed. Also, the 2017 XJ XJR LWB has a more powerful engine than the 2017 Mulsanne Speed, but it gets 4.5 more miles on a gallon of fuel. In addition, the Mulsanne Speed body is slightly larger than the XJ XJR LWB, and in addition to that, it's also taller. Among similarities are the body structure, market segment, and maximum occupancy.