1. 2024 Mitsubishi Mirage | 39 mpg

We’ve covered a number of the bestselling and most impressive fuel-efficient cars on this list, cars like the Hyundai Elantra, Toyota Corolla, Honda Civic, and Nissan Versa, but the 2024 Mitsubishi Mirage beats them all. No, not in terms of driving feel, interior refinement, or exterior aesthetics but in combined fuel efficiency, with a 39-mpg EPA rating for its most frugal model. The Mirage’s 1.2-liter inline-three is relatively anemic at just 78 hp and 74 lb-ft of torque (the engine is mated to a CVT), but the Mirage is also very light, with the heaviest variant barely exceeding 2,100 pounds. So while it can’t match other models in many areas, the Mirage continues to reign supreme as the most efficient (and least expensive) gas-powered car in America.