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There are a number of important reasons why you should learn how to test the air pressure on your car’s tires as well as know how to adjust tire air pressure to optimum levels. Running a car with tires that are not properly inflated decreases the vehicle’s fuel economy, causing you to waste money buying more gas. Tires that are underinflated wear out much more quickly, causing still added expense replacing them. But most importantly, tires left improperly inflated can affect your car’s performance and lead to an accident while driving.

Get to an automotive supply store and invest in an inexpensive digital tire gauge.Confused? Here ‘s a little help . Refer to your owner’s manual or look on the car’s front door jamb to find the recommended tire pressure for your automobile. Don’t check the tires until they have cooled down after driving, which takes at least 30 minutes. Or check them first thing in the morning before you head out. Carefully unscrew the valve cap on the tire and insert the tire guage into the open stem. Press down with steady pressure for a few seconds at most, during which time you’ll likely hear a short hissing sound.

Have a small notebook handy and write down the recorded air pressure of each tire. After recording the pressure of each tire, see how that figure differs from the recommended air pressure, measured as a psi number, or pounds per square inch. If you need to add air to bring up the current number to a higher number, head to the local gas service station to use the air compressor after you have replaced each valve cap.

Before you can insert the air compressor hose to adjust the tire’s air, remove the valve cap again, place the hose fitting over the stem and release air into the tire. There is a gauge on the hose indicating when enough air has been released to adequately adjust the tire’s pressure to the recommended psi level. Check the level again using your own tire gauge before replacing each valve cap. Now you’re ready to safely resume driving.