What Improves Gas Mileage the Most

The single biggest improvement comes from how you drive: moderating highway speeds to about 55–65 mph and accelerating/braking gently can boost fuel economy by roughly 15–40%, more than tire pressure, maintenance, or shedding weight. In short, speed discipline and smooth driving deliver the largest, most reliable gains for most drivers; if you’re choosing a different vehicle, switching to a more efficient model (especially a hybrid) eclipses any single habit change.

The biggest lever: speed and smoothness

For modern gasoline vehicles, the U.S. Department of Energy’s FuelEconomy.gov finds that aggressive driving (speeding, rapid acceleration, hard braking) can cut mileage by 15–30% on highways and 10–40% in city traffic. Fuel economy typically peaks around 50–60 mph and declines rapidly above that. These two factors—your speed and how steadily you drive—overwhelm most other tweaks.

Why speed matters

Aerodynamic drag rises with the square of speed, and the power needed to push air rises even faster. On many cars, moving from 65 to 75 mph can cut fuel economy by 10–20% or more. That’s why “slower is cheaper” on long trips: easing from 75 to 65 mph in a 30‑mpg car over 300 miles can save roughly 1.5–2.5 gallons, depending on the vehicle’s aero and gearing.

Why smooth driving pays

Every hard launch or late brake throws away energy. Anticipating lights, keeping a steady gap, and using gentle throttle reduce waste and let transmissions and engine management stay in efficient zones. In urban traffic, smoothing inputs often dwarfs all other changes you can make in the same car.

High‑impact actions (ranked for most drivers)

The following ranked list focuses on steps most drivers can take immediately in a healthy, modern gasoline vehicle, with typical savings ranges drawn from DOE/EPA guidance and recent testing.

Control speed on highways (aim for 55–65 mph where safe/legal); use cruise control on flat roads to hold a steady pace. Typical improvement: 10–25% versus running 70–80 mph.

Accelerate and brake smoothly; anticipate traffic to avoid stops. Typical improvement: 10–40% in stop‑and‑go, 5–15% on freeways.

Remove rooftop cargo boxes and unused crossbars/racks. Typical impact: 2–25% at highway speeds (higher on small sedans, lower on boxy SUVs).

Fix check‑engine issues promptly—especially oxygen sensors, mass‑airflow sensors, and misfires. Potential improvement: up to ~40% if a major fault is present.

Avoid idling; shut off if parked more than ~60 seconds (except in traffic). Savings vary but add up quickly for delivery and school‑pickup routines.

Plan and combine trips; favor steady, warm‑engine routes over short, cold starts. Typical improvement: 5–10% or more.

Maintain tire pressure at the door‑jamb spec (check monthly, adjust with seasons). Typical improvement: ~0.6% on average; up to ~3% if significantly underinflated.

Lighten the load; clear out heavy cargo you don’t need. Rule of thumb: about 1% per extra 100 lb (effect is larger on small cars).

Use the manufacturer‑recommended oil grade (and “Resource Conserving”/low‑friction oils where specified). Typical improvement: 1–2%.

Keep alignment and brakes in spec; reduce rolling resistance. Impact ranges from negligible to sizable if something’s dragging or badly misaligned.

Taken together, these measures compound: pairing sane speeds with smooth driving and cleaned‑up aerodynamics can easily deliver double‑digit percentage gains without touching the engine.

Vehicle choice is the ultimate lever

If you’re able to switch vehicles, powertrain and size dominate. A hybrid typically delivers 30–50% better city fuel economy than a comparable non‑hybrid. Downsizing from a large SUV to a midsize crossover or wagon can cut fuel use by 20–40% at similar performance. Over a full ownership cycle, these shifts surpass any single habit change.

Targeted tips that often help

These practices don’t usually move the needle as much as speed and smoothness, but they’re easy wins—especially for commuters and road‑trippers.

Use Eco/Efficiency mode if equipped; it softens throttle maps and can trim A/C load, often saving 3–10% in mixed driving.

Air conditioning: at low speeds, cracking windows can use less energy; at highway speeds, moderate A/C with recirculate typically beats the drag from wide‑open windows. A/C penalties commonly run 5–20%, depending on heat and vehicle.

Low rolling‑resistance tires can improve mpg by ~1–4% versus aggressive all‑terrain treads; mind trade‑offs in grip and braking distance.

Top Tier gasoline helps keep injectors clean over time; it’s about preserving designed efficiency, not boosting it beyond spec. Premium fuel only if required.

Telematics/coaching apps and gentle shift strategies in automatics or CVTs can reinforce smooth driving and add 5–15% savings.

None of these on their own rivals slowing down and smoothing inputs, but stacked together they contribute meaningful, real‑world savings.

What doesn’t help much (or at all)

Some popular ideas have little evidence behind them for modern, fuel‑injected cars. Here’s what to treat skeptically.

Premium fuel in engines that don’t require it: no mpg benefit; you just pay more.

Replacing a not‑clogged air filter: little to no mpg change on modern EFI engines (it can improve wide‑open‑throttle performance). Carbureted classics are the exception.

Extended driveway warm‑ups: modern engines need about 30 seconds; idling wastes fuel and increases wear. Drive gently to warm up.

“Fuel‑saving” magnets and most additives: no credible, repeatable lab evidence.

Coasting in neutral or engine‑off coasting: unsafe, often illegal, and modern ECUs already cut fuel during in‑gear deceleration.

Sticking to proven, physics‑backed tactics will save far more fuel—and hassle—than chasing myths.

How to verify your gains

Measuring results keeps you honest and shows which habits pay off on your specific routes and vehicle.

Use your car’s trip computer but reset consistently (same route, similar conditions).

Do brim‑to‑brim calculations over multiple tanks for accuracy.

Track weather, payload, and average speed; wind and temperature can swing results by several percent.

Test one change at a time for at least a week to isolate effects.

A simple log—distance, fuel, average speed, conditions—will reveal trends and help you prioritize what works for you.

Bottom line

If you change nothing else, slow down on highways and drive smoothly everywhere—those two behaviors improve gas mileage more than any other everyday tactic. Combine them with clean aerodynamics, proper maintenance, and good trip planning for compound, durable savings. And if it’s an option, choosing a more efficient vehicle eclipses all other levers.

What trick gets the best gas mileage?

What are easy hacks to make my car have better gas mileage? The easiest one is to slow down. Driving slower will almost always save you gas, especially from about 40mph and up. Accelerate slowly, but steadily. No jackrabbit starts. Don’t stop or slow down if you can help it. slowing down to speed up again wastes fuel.

What helps increase gas mileage?

To get better gas mileage, combine proper maintenance like keeping tires inflated and engines tuned, with smooth driving habits such as avoiding rapid acceleration and hard braking, and using cruise control. Also, reduce unnecessary weight and drag from your vehicle, plan your trips efficiently to avoid congestion, and minimize prolonged idling.
Maintain Your Vehicle

Check tire pressure: Opens in new tabKeep your tires properly inflated to reduce rolling resistance, which improves fuel efficiency.
Replace air filters: Opens in new tabA clogged air filter can reduce your engine’s ability to breathe, making it burn fuel less efficiently.
Perform routine maintenance: Opens in new tabRegular tune-ups, oil changes, and spark plug replacement help your engine run smoothly and efficiently, saving fuel.
Check your engine light: Opens in new tabIf your check engine light is on, have it diagnosed, as a lit light can indicate an issue that’s wasting fuel.

This video explains how to improve fuel economy through car maintenance: 1mHonest Mechanic ColoradoYouTube · Jun 17, 2024
Adjust Your Driving Habits

Drive smoothly: Opens in new tabAccelerate gently and brake gradually to avoid wasting fuel.
Maintain a steady speed: Opens in new tabOnce you’re at speed, maintain a consistent pace, especially on highways, and use cruise control when possible.
Avoid speeding: Opens in new tabFuel efficiency decreases significantly at higher speeds, so staying within the speed limit is more fuel-efficient.
Minimize idling: Opens in new tabTurn off your engine if you expect to be stopped for more than a minute, as idling consumes fuel without going anywhere.
Plan your trips: Opens in new tabCombine errands and map routes to avoid heavy traffic, stop-and-go conditions, and unnecessary backtracking.

This video demonstrates how to improve gas mileage by driving more smoothly and strategically: 46sCashedOutCarsYouTube · Sep 27, 2022
Reduce Vehicle Load and Drag

Lighten the load: Remove any unnecessary weight from your vehicle, as carrying extra weight makes your engine work harder.
Minimize drag: At higher speeds, external factors like roof racks or cargo containers increase aerodynamic drag, reducing fuel economy. Remove these when not in use.

This video explains how to improve gas mileage by reducing vehicle weight and drag: 44sEaziDIYYouTube · Mar 13, 2025

What car gets 70 miles per gallon?

Several vehicles can achieve 70 MPG, particularly with hybrid or diesel powertrains, such as the Toyota Yaris Hybrid or Toyota Prius Plug-In Hybrid, and various diesel models like the Peugeot 208 BlueHDi or Vauxhall Corsa 1.5 Turbo D can also reach this figure under ideal driving conditions. The “best” option depends on whether you prioritize new or used models, gasoline or diesel, and specific driving environments.
Specific Vehicles to Consider

Toyota Yaris Hybrid (and Mazda 2 Hybrid): Opens in new tabThis car has been reported to achieve over 70 MPG, making it a strong option for efficiency.
Peugeot 208 (BlueHDi engine): Opens in new tabThe diesel version of the Peugeot 208 can deliver over 70 MPG.
Vauxhall Corsa (1.5 Turbo D): Opens in new tabSharing its engine with the Peugeot 208, this diesel model also offers similar fuel economy figures.
Toyota Prius Plug-in Hybrid: Opens in new tabWhile its combined EPA rating is lower, the Prius Plug-in can achieve 60-70 MPG on long journeys once the battery is depleted.
Older Honda Insight: Opens in new tabA 1999 model was rated at 70 mpg highway, demonstrating that 70 MPG is achievable with a hybrid powertrain.

Key Considerations

Hybrid vs. Diesel: Opens in new tabSome of the best MPG figures come from diesel cars, while some hybrids also perform exceptionally well, especially when combining battery and gasoline power.
Driving Conditions: Opens in new tabReal-world MPG can vary significantly based on driving style and road conditions. You might see 70 MPG in rural or combined driving, but highway or city driving can affect the final figure.
New vs. Used: Opens in new tabOlder diesel models like the Peugeot 208 and Vauxhall Corsa can achieve high MPG, but a used model is necessary to get them at a lower cost. Newer hybrid models are also a good option.

What can save about 90% of fuel waste?

Maintaining a steady cruising speed and using cruise control when available can significantly reduce unnecessary fuel consumption. Additionally, many people overlook how extra weight in or on the vehicle—such as bike racks or cargo containers—can decrease fuel efficiency. If you don’t need it, leave it behind.