Two Sedans with more similarities, such as the body structure, starting price, height, and maximum occupancy, than differences, like the modifications, horsepower, fuel economy, market segment, and ground shadow size. First of all, the 2015 Subaru WRX STI has a more powerful engine than the 2016 Hyundai Sonata Plug-in Hybrid, and it gets 21 fewer miles on a gallon of fuel. Also, the body structure of 2016 Sonata Plug-in Hybrid is slightly larger than that of the 2015 WRX STI. Among similarities are the body structure, starting price, height, and maximum occupancy.