Lifestyle

7 Gas-Saving Habits That Actually Work, According to Mechanics

By Mike Harper · May 28, 2026

With gas averaging $4.55 per gallon nationally — a figure Consumer Reports confirmed as of late May 2026 — the difference between efficient and inefficient driving habits is real money. Here are seven interventions that mechanics, the Department of Energy, and Consumer Reports testing confirm actually work.

1. Slow down on the highway

Driving 10 mph slower than your usual highway speed can improve fuel economy by up to 8 miles per gallon, according to Consumer Reports testing. The Department of Energy calculates that each 5 mph you drive over 50 is equivalent to paying an additional $0.27 per gallon. Drivers of vehicles that achieve 35 mpg or better could save more than $400 annually just by adjusting their highway cruise speed.

2. Accelerate and brake smoothly

Aggressive driving — rapid acceleration, hard braking, and weaving in traffic — lowers gas mileage by 15-30% at highway speeds and by 5% in city driving, according to the Department of Energy. Consumer Reports testers found that frequent bursts of acceleration and braking reduced a typical sedan’s mileage by 2 to 3 mpg in real-world conditions. Smooth, anticipatory driving requires no additional time and no additional money.

3. Check your tire pressure monthly

Under-inflated tires increase rolling resistance and can reduce your fuel economy by approximately 0.2% for every 1 PSI your tires are below the recommended pressure. Most tires are 5 to 10 PSI low on any given day. The correct pressure for your vehicle is printed on a sticker inside the driver’s door jamb — not on the sidewall of the tire, which shows the maximum pressure. Checking and correcting tire pressure takes two minutes and costs nothing.

4. Remove excess weight from your trunk

Every 100 pounds of unnecessary weight in your vehicle reduces fuel economy by approximately 1%. For a car that gets 30 mpg, 200 pounds of cargo stored permanently in the trunk costs you roughly 0.6 mpg on every trip. Clear out items you don’t need — sports equipment, sand bags, tools, overloaded emergency kits — and keep only what you regularly use.

5. Remove roof racks when not in use

A roof-mounted cargo box or bike rack creates aerodynamic drag that reduces fuel economy by 2 to 17% at highway speeds, depending on the size of the rack and your vehicle. If you use a roof rack only seasonally, removing it when it’s not in active use is one of the simplest high-impact fuel savings available. Takes five minutes.

6. Use cruise control on the highway

Maintaining a constant speed on the highway consistently outperforms human throttle management in terms of fuel efficiency. The Department of Energy and Consumer Reports both confirm that cruise control saves fuel on flat and gently rolling terrain by eliminating the micro-accelerations and decelerations that occur when a driver manually maintains speed. Exception: cruise control in hilly terrain can increase fuel consumption by forcing the engine to maintain speed on inclines rather than allowing a natural speed variation.

7. Check and replace your air filter

A clogged engine air filter can reduce fuel economy measurably — and is one of the cheapest maintenance items on any vehicle. Most vehicles need an air filter replacement every 15,000 to 30,000 miles. A replacement filter costs $15 to $25 and takes 10 minutes to swap. Mechanics say it’s one of the most commonly neglected items on vehicles brought in for service, and one of the easiest wins.

At current prices, implementing all seven of these habits on a vehicle driven 15,000 miles annually could reduce your annual fuel cost by $300 to $700, depending on your current driving habits and vehicle.