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With the newer vehicles out here now, there are fewer maintenance tasks that drivers are involved in performing anymore. One of those is checking and maintaining correct tire pressure in for your vehicle.
First, you will need a reliable pressure gauge. I have tried the pop-up type and the dial-reading type and most are inaccurate. They can be several pounds off either way. The engineers specify the correct pressures in the owner's manual - based on loads carried in the vehicle. For some vehicles, the front and rear tires may carry different pressures.
I went to an aftermarket auto parts store and purchased a digital tire pressure gauge that uses a battery to operate it. It delivers accurate pressures to two decimal places. The cost was $15 or so several years ago.
When checking tire pressures, do it first thing in the morning when tires are cold - not after you have been driving. Tires heat up when being driven and they tend to increase internal pressure, which would give you an incorrect pressure reading should you take it when "hot."
As for adding air, you could go to a place that lets you rent a machine or you could purchase a small air compressor. Some folks have air compressors to power air tools, so they are already one step ahead of the rest.
Be sure both your gauge and compressor can operate up to 100 pounds - which may be needed for RV or heavy truck tires.
Check your owner's manual to see what pressures are required for each axle and then unscrew the protective cap and take a reading. Add air as appropriate and take additional reading(s) as necessary. You can use the gauge (using slight pressure) to remove pressure from the tire by pressing down on the valve until you get the desired pressure reading on your gauge. This may take several steps. Replace the valve cap and you are done. Do this for each tire, and don't forget the spare.
Tire pressures typically reduce more in colder, winter weather. The air escapes around the tire bead. That is the portion that sits on the wheel - which can get pretty cold. You can lose possibly 1/2 pound per tire per day in extremely cold weather - especially if the car is sitting unused. Gauge checks should be performed every few weeks in the cold winter months, and less frequently as temperatures increase. If you do not feel comfortable doing this, take your vehicle to a competent person who can assist you.
Why do we want to keep our tire pressures up? For one thing, it helps improve vehicle handling and overall operating safety. Further, you get optimum fuel economy when tires are properly inflated. Finally, you get more even tire wear and extended tire life with properly inflated tires.
I hope this has been helpful to you. If you have any comments or questions, feel free to respond.