Two Convertibles with more similarities, such as the body structure, market segment, height, and maximum occupancy, than differences, like the starting price, fuel economy, horsepower, and ground shadow size. First of all, the 2016 Porsche 911 Convertible is priced $49,540 lower compared to the base MSRP of the 2016 Maserati GranTurismo Convertible. Also, the 2016 911 Convertible has a more powerful engine than the 2016 GranTurismo Convertible, but it gets 6 more miles on a gallon of fuel. And finally, the GranTurismo Convertible has a slightly larger body than the 911 Convertible. Among similarities are the body structure, market segment, height, and maximum occupancy.