Two Convertibles with more similarities, such as the body structure, market segment, height, and maximum occupancy, than differences, like the starting price, horsepower, fuel economy, and ground shadow size. First of all, there is a notable difference in the starting price of the 2016 Porsche Boxster, which is $77,300 less than the base MSRP of the 2015 Audi R8 Convertible. Also, the 2015 R8 Convertible has a more powerful engine and gets 6.4 mpg less than the 2016 Boxster. And finally, the R8 Convertible has a slightly larger body than the Boxster. Among similarities are the body structure, market segment, height, and maximum occupancy.