How to CheckUse a good quality pocket-type gage to check tirepressure. You cannot tell if your tires areproperly inflated simply by looking at them. Radialtires may look properly inflated even when theyare underinflated. Check the tire’s inflationpressure when the tires are cold. Cold means yourvehicle has been sitting for at least three hoursor driven no more than 1 mile (1.6 km).Remove the valve cap from the tire valve stem.Press the tire gage firmly onto the valve toget a pressure measurement. If the cold tireinflation pressure matches the recommendedpressure on the Tire and Loading Informationlabel, no further adjustment is necessary. If thepressure is low, add air until you reach therecommended amount.If you overfill the tire, release air by pushing onthe metal stem in the center of the tire valve.Recheck the tire pressure with the tire gage.Be sure to put the valve caps back on the valvestems. They help prevent leaks by keeping out dirtand moisture.High-Speed Operation{ CAUTION:Driving at high speeds, 100 mph (160 km/h) orhigher, puts an additional strain on tires. Sustainedhigh-speed driving causes excessive heat build upand can cause sudden tire failure. You could havea crash and you or others could be killed. Somehigh-speed rated tires require inflation pressureadjustment for high speed operation. When speedlimits and road conditions are such that a vehiclecan be driven at high speeds, make sure the tiresare rated for high speed operation, in excellentcondition, and set to the correct cold tire inflationpressure for the vehicle load.If your vehicle has P265/65R18 or P285/45R22 sizetires and you will be driving at high speeds, speeds of100 mph (160 km/h) or higher, set the cold inflationpressure to 3 psi (20 kPa) above the recommended tirepressure shown on the Tire and Loading InformationLabel. When you end this high-speed driving, return thetires to the cold inflation pressure shown on the Tireand Loading Information label. See Loading the Vehicleon page 5-31 and Inflation - Tire Pressure onpage 6-60.6-61
