Two Coupes with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the modifications, model year, horsepower, and fuel economy. First of all, a bigger engine usually means less mpg. But the 2016 ATS-V Coupe has a more powerful engine and it gets 4 more mpg than the 2014 C-Class Coupe C63 AMG. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.