Two Convertibles with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the modifications, starting price, horsepower, and fuel economy. First of all, there is an $86,060 difference in the base MSRP. The 2017 Bentley Continental Convertible GT V8 S has a higher starting price than the 2017 Maserati GranTurismo Convertible. Also, a bigger engine usually means less mpg. But the 2017 Continental Convertible GT V8 S has a more powerful engine and it gets 1 more mpg than the 2017 GranTurismo Convertible. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.