What we have here are two Coupes from Honda with some differences, such as the modifications, horsepower, and ground shadow size. First of all, the 2016 Honda Accord Coupe pulls more horsepower than the 2015 Honda Civic Coupe Si w/Navigation and Summer Tires. Also, the 2016 Accord Coupe is slightly larger than the 2015 Civic Coupe Si w/Navigation and Summer Tires. Among similarities are the body structure, market segment, starting price, fuel economy, height, and maximum occupancy.