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, and fuel economy. First of all, the 2017 Acura RLX Hybrid has a more powerful engine than the 2017 Lexus GS 450h, and it gets 2 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.