The 2016 Toyota Prius Hatchback is a unique and beautiful car. Start with the gas mileage. The Prius is a hybrid electric vehicle, meaning that it uses both a conventional internal combustion engine and an electric power system. The full hybrid system derives its power in part from the battery, and in this way gas mileage is improved tremendously, with no loss of power. The Prius delivers mileage of better than 50 miles per gallon of gas. The Prius can run on the engine alone, or the battery alone, but usually combines the two. In this way the phenomenal gas mileage numbers are achieved.