Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, fuel economy, model year, and horsepower. First of all, there is a notable difference in the starting price of the 2016 Audi A8, which is $217,400 less than the base MSRP of the 2014 Bentley Mulsanne, which is two model years older. And finally, the 2014 Mulsanne has bigger and thirstier engine; the 2016 A8 gets 6 more mpg. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.