To check whether your car is using more fuel, measure its miles per gallon (MPG) over several full-to-full tank intervals and compare results from similar driving. A single fill-up or dashboard estimate can be misleading. If the drop persists under comparable conditions, check tire pressure and arrange an inspection—especially if a warning light or other symptom appears.
Measure fuel economy across several fill-ups
Use the same method each time so you can compare one tank with another:
- Fill the tank completely and reset the trip odometer.
- Drive as you normally would. Record the trip distance and gallons added at the next refill.
- Divide the miles driven by the gallons added: miles driven ÷ gallons added = MPG.
- Repeat for several tanks, recording each result. Small differences in when a pump stops or how full the tank is can distort a single reading.
For example, AAA Oregon/Idaho illustrates the calculation with 375 miles divided by 9.5 gallons, or about 40 MPG. That is an example of the arithmetic, not a target for every car. See AAA Oregon/Idaho’s MPG calculation method.
If your car displays average MPG, record it as well. Use the dashboard figure to follow a trend, not as a replacement for consistent fill-to-fill calculations. In markets that use L/100 km, use the car’s displayed units or a correctly configured conversion; U.S. and Imperial gallons are different, so don’t mix units.
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Make sure the comparison is fair
Fuel economy changes with the way and place a car is driven. Before assuming a fault, consider whether recent trips involved different conditions from the earlier comparison period:
- More stop-and-go traffic, short trips, idling, hills, or hard acceleration and braking.
- Higher highway speeds. The U.S. Department of Energy says each vehicle has its own most-efficient speed or speed range, and fuel economy usually decreases rapidly above 50 mph. This is not a universal optimum or a recommended driving speed; follow safe and legal limits. DOE Consumer Guide to Fuel Economy (2021).
- Cold-season temperatures, towing, or extra weight in the vehicle.
- A roof rack or carrier that was not present during earlier measurements.
For a useful comparison, look for patterns across several tanks driven on similar routes and under similar conditions. Removing an unused roof carrier and unnecessary heavy cargo are practical checks, but any fuel-economy effect depends on the vehicle and how it is driven. AAA discusses these and other driving and load factors in its fuel-saving tips.
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Check tire pressure and basic maintenance
Use the vehicle’s recommended tire pressure
Check tires when they are cold, using a pressure gauge, and inflate them to the specification on the driver-side door placard or in the owner’s manual. Do not use the maximum pressure printed on the tire sidewall as the vehicle’s target. Some tire-pressure monitoring systems (TPMS) show only a warning light, which may not illuminate until a tire is substantially underinflated; AAA recommends periodic manual checks. See AAA Oregon/Idaho’s October 2023 TPMS overview.
The U.S. Department of Energy’s 2021 consumer guide estimates that underinflated tires can lower gas mileage by 0.2% for every 1 psi drop in pressure across all four tires; it says proper inflation improves gas mileage by 0.6% on average, and up to 3% in some cases. These are guide estimates, not guaranteed savings for an individual vehicle. DOE Consumer Guide to Fuel Economy (2021).
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Follow the vehicle’s maintenance requirements
Follow the manufacturer’s maintenance schedule and specified oil and fuel requirements. MPG alone is not enough to identify a part that needs replacement, so avoid treating it as a reason for a generic tune-up. DOE says fixing a car that is noticeably out of tune or has failed an emissions test can improve gas mileage by an average of 4%; the result depends on the repair and how it is performed. DOE Consumer Guide to Fuel Economy (2021).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Know when to arrange an inspection
Ask a repair professional to investigate if MPG remains materially lower across comparable fill-ups, rather than trying to infer the cause from the number alone. Make an appointment promptly if the check-engine light is on; AAA advises having the car checked because an emissions-related problem can also reduce fuel economy.
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Rough running, an unusual smell or noise, or an abnormal-feeling tire or brake also warrants attention. Incorrect tire pressure, a faulty oxygen sensor, and bad fuel injectors are among the possible causes of poor mileage listed by AAA, but none can be diagnosed from an MPG calculation alone. Ask the repairer to identify the cause before replacing parts. See AAA’s guide to tune-up warning signs and possible causes.
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