Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, fuel economy, and horsepower. First of all, the 2016 Audi A8 is priced $222,200 lower compared to the base MSRP of the 2015 Bentley Mulsanne. And finally, the 2015 Mulsanne has a more powerful engine than the 2016 A8, and it gets 6 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.