You don't need a new car to spend less on gas. These proven techniques can meaningfully improve your fuel economy.
Aerodynamic drag increases exponentially with speed. Driving 65 mph instead of 75 mph can improve fuel economy by 10–15%. The EPA estimates that each 5 mph over 50 mph costs you roughly 7–14% in fuel efficiency.
Under-inflated tires create more rolling resistance. Check your tire pressure monthly — the correct PSI is on the sticker inside your driver's door, not on the tire itself. Properly inflated tires can improve MPG by up to 3%.
Smooth acceleration and anticipating stops (coasting to decelerate) can improve fuel economy by 15–30% in city driving. Harsh braking converts your car's momentum (paid for by fuel) directly into heat.
Aggressive driving (speeding, rapid acceleration, hard braking) can lower your gas mileage by 15–30% on the highway and 10–40% in stop-and-go traffic.
Remove unnecessary items from your trunk and roof rack when not in use. An extra 100 lbs reduces fuel economy by about 1%. Roof cargo carriers dramatically increase aerodynamic drag — remove them when not needed.
Maintaining a steady speed is more fuel-efficient than the subtle speed variations most drivers make. On flat highway driving, cruise control can improve fuel economy by 7–14%.
A properly tuned engine runs more efficiently. Replace air filters regularly, use the recommended grade of motor oil, and keep spark plugs in good condition. A clogged air filter alone can reduce fuel economy by 10%.
AC can reduce fuel economy by 5–25%, especially at low speeds. At highway speeds, closing windows and running AC is usually more efficient than open windows (due to drag). In the city, roll down the windows if comfortable.