When gas prices rise, focus on two things: use fewer gallons by driving and maintaining your vehicle efficiently, and reduce how often you need to drive. Start with free changes—smoother driving, less idling, lighter loads and combined trips—then check tire pressure and follow the maintenance schedule in your owner’s manual. The size of any savings depends on your vehicle and driving conditions; no single step guarantees a fixed amount.
Which changes can lower fuel use without spending money?
Driving habits and trip planning are the quickest places to start. The U.S. Department of Energy’s 2021 consumer guide estimates that aggressive driving—such as speeding, rapid acceleration and hard braking—can lower gas mileage by roughly 15%–30% at highway speeds and 10%–40% in stop-and-go traffic. These are broad estimates, not a prediction for every driver or vehicle. DOE fuel-saving driving tips.
Accelerate and brake smoothly
Build speed gradually and leave enough room to slow down without hard braking when traffic allows. Look ahead so you can respond steadily to traffic rather than repeatedly accelerating and stopping. Drive at a safe speed that follows posted limits and suits road and weather conditions.
Avoid unnecessary high speeds
Fuel economy varies by vehicle, and there is no universal most-efficient speed for every car. DOE says mileage usually declines rapidly above 50 mph, but that is not a reason to drive below the speed of traffic or disregard safety. Follow speed limits and conditions; when a trip allows it, avoiding unnecessary high-speed driving can help reduce fuel use.
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Switch off the engine when parked
DOE estimates that idling uses about a quarter to a half gallon of fuel per hour, depending on engine size and air-conditioning use. Its Alternative Fuels Data Center advises turning off a personal vehicle when parked or stopped for more than 10 seconds, except in traffic. DOE idling guidance.
Remove cargo you do not need
Take out heavy items that do not need to stay in the vehicle. DOE estimates that an extra 100 pounds can reduce fuel economy by around 1%; the effect depends on the added weight relative to the vehicle and is greater for smaller vehicles. Remove roof cargo or carriers when they are not needed, since carrying equipment outside the vehicle can increase fuel use.
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How can trip planning cut the gallons you use?
Reducing miles driven can matter as much as improving miles per gallon. Choose options that fit your schedule, location and needs rather than treating any one alternative as practical for everyone.
- Combine errands: Plan several stops in one outing instead of making separate trips.
- Avoid peak stop-and-go conditions when feasible: Shifting a trip time can reduce time spent in congested traffic, if your schedule allows.
- Consider another way to make a short trip: Walking, cycling or using transit may work for some journeys and locations.
- Carpool when it suits the trip: Sharing a ride can reduce the number of vehicles making the same journey.
How should you check tire pressure?
Properly inflated tires can improve fuel economy. DOE’s 2021 guide estimates an average improvement of 0.6%, and up to 3% in some cases. NHTSA recommends checking tires when cold at least monthly and using the pressure specified on the vehicle’s tire placard or in the owner’s manual—not the maximum pressure printed on the tire sidewall. NHTSA TireWise guidance.
- Check pressure before driving, or after the vehicle has been parked for at least three hours, so the tires are cold.
- Find the recommended pressure on the vehicle placard or in the owner’s manual.
- Use a tire pressure gauge to check each tire, including the spare if applicable, and add or release air as needed.
- Repeat the check at least monthly and whenever the vehicle’s tire-pressure warning or a visible problem calls for attention.
NHTSA advises: “Keep a tire pressure gauge in your vehicle.” A digital gauge is one option, but you do not need to buy one if you already have a way to check pressure accurately.
What maintenance can help—and what should you avoid?
Follow the maintenance schedule and specifications in the owner’s manual. DOE estimates that using the motor-oil grade recommended by the manufacturer can improve fuel economy by 1%–2%; EPA also recommends regular maintenance and the recommended oil grade. The actual effect depends on the vehicle and its condition. EPA fuel-economy tips.
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Do not assume that buying an additive, replacing a part early or paying for an unspecified repair will lower fuel costs. DOE notes that replacing a clogged air filter on modern fuel-injected, computer-controlled gasoline engines does not improve fuel economy, although it may improve acceleration. Address maintenance issues according to your vehicle’s manual and a qualified technician’s advice, not as a guaranteed fuel-saving purchase. DOE gas-saving fact sheet.
How should you prioritize these steps?
| Action | What it changes | Cost or dependency |
|---|---|---|
| Drive smoothly and avoid unnecessary speed | Can improve fuel economy by reducing inefficient acceleration, braking and high-speed driving | No purchase required; adapt to road safety and traffic |
| Reduce idling | Avoids fuel burned while the engine runs without moving | No purchase required; do not switch off in traffic |
| Remove unused cargo and roof equipment | Reduces weight or the burden of carrying external cargo | No purchase required if the equipment is not needed |
| Combine trips or share a ride | Can reduce miles driven or the number of vehicles used | Depends on schedule, location and household needs |
| Check tire pressure monthly | Helps avoid fuel-economy loss from underinflated tires | Use the vehicle’s specified pressure; a gauge is optional if you already have a reliable way to check |
| Use the manufacturer-recommended oil and maintenance schedule | Maintains the vehicle as specified; recommended oil grade may support fuel economy | Depends on the vehicle and its maintenance needs |
How to interpret fuel-savings estimates
Percentages from government guides are estimates, not guaranteed results for your car. Your outcome depends on factors such as vehicle design, starting condition, weather, roads and driving pattern. Dollar examples in DOE’s 2021 consumer guide use U.S. gasoline prices from December 2021; a separate DOE fact sheet bases its savings estimates on $2.45 per gallon. Neither figure should be treated as a current estimate of what a driver will save at today’s pump prices. DOE driving efficiently guidance.
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