Two Hatchbacks with more similarities, such as the body structure, starting price, horsepower, ground shadow size, height, and maximum occupancy, than differences, like the model year and fuel economy. First of all, the 2014 Sonic Hatchback gets 1.5 more miles on a gallon than the 2016 Rio Hatchback. Among similarities are the body structure, starting price, horsepower, ground shadow size, height, and maximum occupancy.