What we have here are two Coupes from Audi with some differences, such as the starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2016 Audi TTS is priced $64,000 lower compared to the base MSRP of the 2015 Audi R8 Coupe. Also, the 2015 R8 Coupe has bigger and thirstier engine; the 2016 TTS gets 9.4 more mpg. In addition, although the R8 Coupe is slightly larger, it has a shorter body than the TTS. And finally, there is a difference in the number of passengers; the Audi TTS seats two more the Audi R8 Coupe. Among similarities are the body structure and market segment.