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If your tires are under inflated the resulting "resistance" created will lower your gas mileage. However, if you maintain the correct pressure in your tires it reduces the resistance and improves your car's efficiency. It's also safer.

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Q: How does tire pressure affect a car's fuel efficiency?
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The size and quality of a vehicle's tires affect fuel efficiency. Bad spark plugs will cause cars and trucks to use more gas.


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