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, horsepower, fuel economy, and model year. First of all, the 2014 C-Class Sedan has a more powerful engine than the 2016 A3 Sedan Diesel, and it gets 12.7 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.