#51 Air up your tires. Did you know that for every two PSI that all of your tires are below the recommended level, you lose 1% on your gas mileage? Many cars are 5-10 PSI below the recommended level which means that just by airing up your tires you can improve your gas mileage by 5%. Most gas stations offer air for free or charge 25 cents. Check your car's owners manual and use a tire gauge to check your tire pressure. If your tires are low, air them up to the recommended PSI!
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