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The reason to check your tire pressure now is that when the outdoor temperature drops, the air inside your tires shrinks. This causes the pressure to drop. It is important to keep your tire pressure on your cars at the proper level. You will usually find it on the a label on the door post. The proper tire pressure will increase your gas mileage and make your car safer to drive. Low tire pressure can make your car handle badly. About two years ago on Christmas Eve, I wrecked my Porsche because of low tire pressure (and going around a turn too fast).