Two Convertibles, but completely different in all significant aspects: model year, modifications, fuel economy, ground shadow size, height, starting price, horsepower, and maximum occupancy. First of all, there is a $2,975 difference in the base MSRP. The 2016 FIAT 500 Convertible C Abarth, a newer vehicle by three model years, has a higher starting price than the 2013 Mazda MX-5 Miata. Also, the 2013 MX-5 Miata has bigger and thirstier engine; the 2016 500 Convertible C Abarth gets 16 more mpg. In addition, although the 500 Convertible C Abarth is significantly smaller, it has a taller body than the MX-5 Miata. And then, the FIAT 500 Convertible C Abarth seats two more passengers than the Mazda MX-5 Miata. Among similarities are the body structure and market segment.