Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the model year, horsepower, fuel economy, and market segment. First of all, the 2013 CTS-V has a more powerful engine and gets 15 mpg less than the 2016 GS 450h. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.