Two Coupes with more similarities, such as the body structure, height, and maximum occupancy, than differences, like the starting price, horsepower, fuel economy, and ground shadow size. First of all, there is an $18,050 difference in the base MSRP. The 2016 BMW 4 Series Coupe has a higher starting price than the 2015 Ford Mustang Coupe. Also, the 2015 Mustang Coupe has a more powerful engine and gets 3 mpg less than the 2016 4 Series Coupe. And finally, the 4 Series Coupe is slightly smaller than the Mustang Coupe. Among similarities are the body structure, height, and maximum occupancy.