Air Pressure Tips
Tires don't really carry the weight of your vehicle ... the air pressure inside them does. And the correct air pressure is also required for good handling, traction and durability.
HOWEVER, YOU CAN'T SET IT AND JUST FORGET IT! In most parts of North America, fall and early winter months are the most critical times to check inflation pressures because the days are getting shorter and temperatures are getting colder. And since air is a gas, it contracts when cooled.
FOR EVERY 10 DEGREE FAHRENHEIT CHANGE In ambient temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower.)
The typical difference between summer and winter temperatures is about -50 degrees Fahrenheit - which results in a loss of about 5 psi and will sacrifice handling, traction, durability ... and fun!
THE TIRE PRESSURE RECOMMENDED in your vehicle's owner's manual or tire information sticker is a "cold" pressure, so it should be checked in the morning before you drive more than a few miles.
And by the way, if you park in an attached or heated garage you will "lose" pressure when you leave its warmth and venture into the real world outside.