What we have here are two Convertibles from Audi with some differences, such as the horsepower, model year, starting price, and fuel economy. First of all, the 2016 Audi S5 Convertible is priced $16,800 lower compared to the base MSRP of the 2014 Audi RS 5 Convertible, which is older by two model years. And finally, the 2014 RS 5 Convertible has a more powerful engine and gets 3 mpg less than the 2016 S5 Convertible. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.