Check the inflation pressure.
It is important to do this routinely, preferably monthly. The correct
inflation pressure is on a tire information placard found on the
driver's door jamb. Adjust the inflation pressure when the tires are
cold or when the car has been parked for three or more hours. 
1030 South Grand Avenue, Pullman, WA 99163-2143 (509) 332-4075
Tire Maintenance Tip #2
Check the inflation pressure.
It is important to do this routinely, preferably monthly. The correct
inflation pressure is on a tire information placard found on the
driver's door jamb. Adjust the inflation pressure when the tires are
cold or when the car has been parked for three or more hours. 