36 City / 43 Highway / 39 Combined

The cheapest car of 2019 is also the most fuel efficient. Even with relatively recent updates, the Mitsubishi Mirage maintains its 36 miles per gallon city, 43 highway, and 39 combined rating, beating the next-best Chevy Cruze Diesel by a modest two MPG overall. With its tiny 1.3-liter engine, just 78 horsepower (58 kilowatts), and a continuously variable transmission, Mirage owners spend an average of $950 per year on fuel.