If you want to save gas and reduce auto maintenance you should avoid underinflated tires. You can improve gas mileage consumption by up to 3.3 percent by keeping your tires properly inflated to the manufacturers suggested pressure rating. Underinflated tires can lower gas mileage by 0.3 percent for every 1 PSI drop in pressure which can really add up. Lastly, underinflated tires are less safe and don’t last as long as properly inflated tires.
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