Two Coupes with some similarities, but otherwise different in most aspects such as the modifications, starting price, market segment, horsepower, fuel economy, and maximum occupancy. First of all, the 2015 Honda Civic Coupe Si is priced $9,960 lower compared to the base MSRP of the 2016 BMW 2 Series Coupe. Also, a bigger engine usually means less mpg. But the 2016 2 Series Coupe has a more powerful engine and it gets 2 more mpg than the 2015 Civic Coupe Si. In addition, you'll seat one more passenger in the Civic Coupe Si than in the 2 Series Coupe. Among similarities are the body structure, ground shadow size, and height.