1. Toyota Prius It should be no surprise that the Prius is the most fuel-efficient vehicle without a plug, as it has been for most years since it launched in the U.S. for the 2001 model year.

Wondering which cars are most efficient? We scoured through EPA data to find out which cars get the best gas mileage. Check out what made our list of cars with the best gas mileage in 2025.

Emissions are down, fuel economy levels are up. Higher adoption of fully electric vehicles and plug-in hybrids led to a record drop in new-vehicle emissions in the U.S. in 2023.

For 50 years, automakers have had to increase the fuel efficiency of their vehicles or pay fines. The Republican megabill would set those penalties to $0. By Brad Plumer and Jack Ewing The E.P.A ...

Take, for example, the 8-cylinder Hemi engine. The Hemi is not terribly fuel efficient, getting at best 21 miles per gallon in a recent truck model.

Check. Check. Check. Chalk one up for market forces. Then, 10 or 15 years ago, the emphasis on fuel efficiency, specifically low rolling resistance, received a significant push from regulators.

The North American Council for Freight Efficiency’s 10th Annual Fleet Fuel study has found rapidly rising fuel efficiency performance for long-haul fleets.