Did you know that most cars on the road have improper air pressure in the tires? This not only affects your gas mileage, but the handling of your vehicle as well. It also makes the tires wear unevenly.
Do not check the tire pressure after you’ve been driving! The friction of the tires on the road creates heat and will give you the wrong reading. Always check the tire pressure before you start driving, or after it has set for at least 3 hours.
Look in your owner’s manual, which will usually refer you to a label or decal somewhere on the car, typically on the driver’s side door jamb, the tire pressure recommended in the manual or on the door jamb is what is called a cold pressure. This does not mean that it is only for cold weather but the temperature that your tires should have before starting to drive on them for the day.
I recommend that you use a good tire pressure gauge. One that holds the reading so that you can remove the gauge from the tire to get a closer look at the number, also, one with a flexible hose so that there is no fiddling with the valve stem.
Check your tire pressure often, tires can lose 1 PSI for every 10 degrees the temperature drops, so it is important to regularly check your vehicle’s tire pressure at least once a month.