Check Tire Pressure Regularly: Tire pressure should be checked whenever you suspect a problem or at a minimum, seasonally. Symptoms of improper tire pressure include excess wear and squealing when going around a corner (for under-inflated tires) and reduced traction (for over-inflated tires). Even the temperature can affect your tire pressure. Check your owner's manual to find where they've posted the proper tire pressure (usually on one of the doors) and be sure to keep it at that level. An improperly inflated tire not only wears quicker, it can also be dangerous when stopping and can cause tread separation. You can purchase a tire-pressure gauge at your local auto parts store, use a gauge at the gas station or ask your tire dealer to check it for you.