Last week, my Honda Odyssey’s tire pressure warning light came on. Since a low pressure tire can be dangerous, waste gas, and wear down your tires prematurely, I was glad to have the warning.
This happens every year since air is a gas and it contracts when cooled. With approaching winter, your tire’s air pressure decreases.
If you last filled your tires when the outside temperature was 82 F and this morning the temperature is 32 F, your tire pressure has been reduced by 10%. For my Honda Odyssey, that is a 4 psi drop from 35 to 31 psi. In addition, the rule of thumb is that you also lose about 1 psi per month due to air permeating through the tire’s sidewall. No surprise then that I found my tires at a dangerously low 28 psi.
You can find out what the cold tire inflation pressure should be from the label that is found on the pillar next to the driver’s seat or from your vehicle’s owner’s manual. Remember to fill your tires in the morning before you drive more than a few miles or before rising ambient temperatures or the sun’s rays affects your tire pressure.