Two Coupes with some similarities, but otherwise different in most aspects such as the horsepower, fuel economy, ground shadow size, starting price, height, and maximum occupancy. First of all, there is a notable difference in the starting price of the 2016 Alfa Romeo 4C Coupe, which is $15,000 less than the base MSRP of the 2015 Audi RS 5 Coupe. Also, the 2015 RS 5 Coupe has bigger and thirstier engine; the 2016 4C Coupe gets 10 more mpg. In addition, not only 4C Coupe is significantly smaller, but it's also slightly shorter than the RS 5 Coupe. And finally, there is a difference in the number of passengers; the Audi RS 5 Coupe seats two more the Alfa Romeo 4C Coupe. Among similarities are the body structure and market segment.