Two Convertibles, but completely different in all significant aspects: model year, powertrain, height, starting price, horsepower, fuel economy, ground shadow size, and maximum occupancy. First of all, the 2016 Mazda MX-5 Miata is priced $2,980 lower compared to the base MSRP of the 2013 Volkswagen Beetle Convertible Diesel, which is older by three model years. Also, the 2016 MX-5 Miata has a more powerful engine than the 2013 Beetle Convertible Diesel, and it gets 2 fewer miles on a gallon of fuel. In addition, the MX-5 Miata is both slightly smaller and significantly shorter than the Beetle Convertible Diesel. And then, there is a difference in the number of passengers; the Volkswagen Beetle Convertible Diesel seats two more the Mazda MX-5 Miata. Among similarities is the body structure.