Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, and height, than differences, like the powertrain, horsepower, fuel economy, and starting price. First of all, the 2016 Jaguar XJ has a more powerful engine and gets 8.4 mpg less than the 2015 Audi A8 Diesel. Also, there is a $10,700 difference in the base MSRP. The 2015 A8 Diesel has a higher starting price than the 2016 XJ. Among similarities are the body structure, market segment, ground shadow size, and height.