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, market segment, horsepower, and fuel economy. First of all, a bigger engine usually means less mpg. But the 2016 Mercedes-Benz C-Class Hybrid has a more powerful engine and it gets 5 more mpg than the 2016 BMW 4 Series Gran Coupe. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.