Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, horsepower, fuel economy, starting price, and ground shadow size. First of all, the 2016 Mazda 6 has a more powerful engine and gets 14.7 mpg less than the 2015 Honda Civic Sedan Hybrid. Also, there is a $3,240 difference in the base MSRP. The 2015 Civic Sedan Hybrid has a higher starting price than the 2016 6. In addition, the Civic Sedan Hybrid is slightly smaller than the 6. Among similarities are the body structure, height, and maximum occupancy.