Two Convertibles with some similarities, but otherwise different in most aspects such as the modifications, starting price, horsepower, fuel economy, ground shadow size, and height. First of all, the 2017 Porsche 911 Convertible is priced $220,900 lower compared to the base MSRP of the 2017 Bentley Continental Convertible Supersports. Also, the 2017 Continental Convertible Supersports has bigger and thirstier engine; the 2017 911 Convertible gets 9 more mpg. In addition, not only Continental Convertible Supersports is slightly larger, but it's also taller than the 911 Convertible. Among similarities are the body structure, market segment, and maximum occupancy.