Two Convertibles with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2017 Maserati GranTurismo Convertible is priced $29,360 lower compared to the base MSRP of the 2017 Audi R8 Convertible. Also, although the 2017 R8 Convertible has a more powerful engine than the 2017 GranTurismo Convertible, it gets 2 more mpg. In addition, the R8 Convertible body is slightly smaller than the GranTurismo Convertible, and in addition to that, it's also shorter. And finally, you'll seat two more passengers in the Maserati GranTurismo Convertible than in the Audi R8 Convertible. Among similarities are the body structure and market segment.