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, there is a notable difference in the starting price of the 2016 FIAT 500 Convertible, which is $21,425 less than the base MSRP of the 2016 Nissan 370Z Convertible. Also, the 2016 370Z Convertible has bigger and thirstier engine; the 2016 500 Convertible gets 13.5 more mpg. In addition, although the 500 Convertible is significantly smaller, it has a slightly taller body than the 370Z Convertible. And finally, the FIAT 500 Convertible seats two more passengers than the Nissan 370Z Convertible. Among similarities is the body structure.