Newer cars have a tire-pressure warning light to let you know that your tires are low on air, but older cars do not. A sticker on the driver's door pillar lists the proper inflation pressure for when the tires are cold (meaning that you haven't yet driven on them that day). If you set the pressures after you've been driving for a while (more than a few miles), they should be raised by three pounds per square inch, as tires warm up and pressures rise when they are driven on. Check your tire pressures once a month for a couple of months. If the pressures remain steady, you can check them quarterly, as you know the tires are holding air.
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