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, and fuel economy. First of all, the 2016 GS F has a more powerful engine and gets 3 mpg less than the 2014 6 Series Gran Coupe. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.