Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, modifications, market segment, horsepower, fuel economy, and ground shadow size. First of all, a bigger engine usually means less mpg. But the 2017 Acura RLX Hybrid has a more powerful engine and it gets 6 more mpg than the 2017 Volvo S60 T6 Polestar. Also, the body structure of 2017 RLX Hybrid is slightly larger than that of the 2017 S60 T6 Polestar. Among similarities are the body structure, market segment, starting price, height, and maximum occupancy.