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 modifications, horsepower, and fuel economy. First of all, although the 2016 Audi S6 has a more powerful engine than the 2015 Cadillac CTS Vsport Premium, it gets 3 more mpg. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.