Not taken seriously by novice drivers：
Vehicle manufacturers specify PSI – literally “pounds per square inch” of pressure (assuming tires are cold).On newer cars, the recommended tire pressure is most commonly listed on a sticker inside the driver’s door. If there’s no sticker on the door, you can usually find the specs in the owner’s manual. Most passenger cars will recommend 32 psi to 35 psi in the tires when they’re cold. For trucks, front and rear tires require different pressure levels generally, by the way.
Incorrect Tire pressure may cause unusual gas mileage, a little lower or higher; steering seems a little sluggish. Such little case may be ignored by novice drivers until they realized the tire pressure.
How to Check Tire Pressure：
1. Start with cold pressure if possible. The reason you check tire pressure when they’re cold is that as tires roll along the road, friction between them and the road generates heat, increasing both the temperature and the air pressure. For the most accurate reading (not to mention the most consistent one), make sure the car has been sitting overnight or at least has been parked for a few hours.
2. Check the recommend PSI. Find it on the front door or you can consult your vehicle dealer, manufacturer or a qualified tire professional.
3. Check the pressure with gauge and full fill the recommend PSI. Remove the valve cap from one of your tires. Then place the pressure gauge on the valve stem and press down hard enough so the hiss sound disappears and your gauge provides a reading. With a standard gauge, the air pressure will push a small bar out from the bottom of the gauge. Measurement units are etched into the bar. A digital gauge will show you the reading on a screen use an air compressor to refill any tires with low pressure. Many air compressors are different, so read directions carefully to be sure you’re using it correctly. After filling your tires, use the gauge to check pressure again.
4. Repeat, check the pressure monthly. Make the above procedure a monthly ritual. Regularly checking your tire pressure is the best way to ensure your tires never dip far below the optimal PSI.
Finally
Overinflating of your tires will give you a bouncy ride and an ill-handling car, while driving on underinflated tires can cause premature wear from increased friction. Either way, not having your tires inflated to their recommended pressure will negatively affect tire wear and vehicle performance. For tire pressure gauge, accuracy matters and it's best to use your personal tire gauge versus those available attached to air hoses at service stations. You may find it here:
Digital Tire Inflator with Pressure Gauge 250 PSI Air Chuck for Truck/Car/Bike
300 PSI LCD Digital Tire Pressure Air Inflator Accurate High Gauge Tire Car
