2015 Jeep Grand Cherokee Owner Manual - Page 505

STARTING AND OPERATING 503 inflation pressure should be increased by 3 psi (21 kPa), which equals 1 psi (7 kPa) for every 12°F (7°C) for this outside temperature condition. Tire pressure may increase from 2 to 6 psi (13 to 40 kPa) during operation. DO NOT reduce this normal pressure build up or your tire pressure will be too low. Tire Pressures For High Speed Operation WARNING! High speed driving with your vehicle under maximum load is dangerous. The added strain on your tires could cause them to fail. You could have a serious collision. Do not drive a vehicle loaded to the maximum capacity at continuous speeds above 75 mph (120 km/h). The manufacturer advocates driving at safe speeds and Radial Ply Tires within posted speed limits. Where speed limits or conditions are such that the vehicle can be driven at high WARNING! speeds, maintaining correct tire inflation pressure is very important. Increased tire pressure and reduced vehicle Combining radial ply tires with other types of tires loading may be required for high-speed vehicle opera- on your vehicle will cause your vehicle to handle tion. Refer to your authorized tire dealer or original poorly. The instability could cause a collision. Alequipment vehicle dealer for recommended safe operat- ways use radial ply tires in sets of four. Never ing speeds, loading and cold tire inflation pressures. combine them with other types of tires. 5