Should I Fill My Tires When It’s Cold?
Yes, you should generally fill your tires when cold, because tire pressure drops as temperatures fall and underinflation affects safety, handling, and fuel economy. The best practice is to check pressure before driving, when tires are truly cold, and inflate to the vehicle manufacturer’s recommended PSI rather than the maximum molded on the tire sidewall. Be cautious not to overinflate, and remember that pressure readings taken in a warm garage differ from outside temperatures.