2009 Pontiac G8 Owner's Manual - Page 254

9-50 Vehicle Service and Care Recommended Cold Tire Inflation Occupant and Cargo Weight: Occupant and Cargo Weight: 573 lbs (260 kg) or Less Up to 917 lbs (416 kg) (Vehicle Capacity Weight) Front Tires Rear Tires Front Tires Rear Tires 33 psi (230 kPa) 33 psi (230 kPa) 36 psi (250 kPa) 39 psi (270 kPa) 36 psi (250 kPa) 36 psi (250 kPa) 36 psi (250 kPa) 39 psi (270 kPa) 36 psi (250 kPa) 36 psi (250 kPa ) 36 psi (250 kPa) 39 psi (270 kPa) 60 psi (420 kPa) 60 psi (420 kPa) 60 psi (420 kPa) 60 psi (420 kPa) Tire Size P245/45R18 96V 245/45R18 96V 245/40R19 94W T155/80R17 111M (Compact Spare) When to Check Check your tires once a month or more. Do not forget the compact spare tire, if your vehicle has one. It should be at 60 psi (420 kPa). For more information about the vehicle's compact spare tire, see Compact Spare Tire on page 9-83. How to Check Use a good quality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they're underinflated. Check the tire's inflation pressure when the tires are cold. Cold means your vehicle has been sitting for at least three hours or 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 to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until you reach the recommended amount.