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 powertrain, modifications, horsepower, and fuel economy. First of all, the 2015 Cadillac CTS Vsport has a more powerful engine and gets 12 mpg less than the 2016 Audi A6 Diesel. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.