10 Proven Ways to Improve Gas Mileage (and How Much Each Saves)

Driving habits and maintenance tips backed by FuelEconomy.gov, ranked by how much they can cut your fuel bill.

Updated October 8, 2026

Driving habits — the biggest gains

1. Drive calmly: aggressive driving (speeding, rapid acceleration, hard braking) can lower highway mileage by 15–30% and city mileage by 10–40%, according to FuelEconomy.gov.
2. Slow down on the highway: fuel economy usually drops rapidly above 50 mph.
3. Use cruise control on flat highways to hold a steady speed.
4. Don’t idle for long periods.
5. Remove roof racks and cargo boxes when not in use — they add significant drag at highway speed.

Maintenance

6. Keep tires at the recommended pressure (see tire pressure and MPG).
7. Use the recommended grade of motor oil.
8. Fix engine problems such as a faulty oxygen sensor, which can hurt mileage noticeably.
9. Remove unnecessary weight from the trunk.
10. Plan and combine trips: a cold engine uses more fuel.

Then make sure you pay a fair price per gallon: compare stations and use the detour calculator before driving across town.

Frequently asked questions