Does Lowering Windows Improve Gas Mileage? COMMUNITY-REPORTED
Lowering your windows can affect fuel economy, but the impact varies by speed and conditions.
The Effect of Open Windows on Fuel Economy
Lowering your windows can reduce the need for air conditioning, which uses fuel. However, open windows also create aerodynamic drag, especially at higher speeds. At low speeds, the drag is minimal, and it can be more fuel-efficient to drive with the windows down rather than using the A/C.
At highway speeds, the increased drag from open windows can negate any fuel savings from not using the A/C. Studies suggest that the drag can be significant enough that running the A/C might actually be more efficient at those speeds.
Using a Door Visor
Installing a door visor can help reduce wind noise and turbulence when driving with the windows down, potentially making it more comfortable. However, it does not significantly change the aerodynamic effects caused by having the windows open.
Practical Tips
For city driving or at lower speeds, lowering the windows can be a good way to save fuel compared to using the A/C. For highway driving, it's generally better to keep the windows up and use the A/C for comfort and efficiency.
Answered from our EPA fuel data and general, well-established fuel facts in response to real driver questions. Anything car-specific — especially whether premium is required vs recommended — is in your owner's manual, so we point you there instead of guessing.
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EPA/DOE FuelEconomy.gov data retrieved 2026-07-24.