2007 Saturn Ion Owner's Manual - Page 339

The low-profile performance tires, size 215/45ZR17, require tire inflation pressure adjustment when driving your vehicle at speeds of 100 mph (160 km/h) or higher. Set the cold tire inflation pressure to 33 psi (227 kPa) for the front and rear tires when operating your vehicle at high-speed conditions. When you end high-speed driving, return the tires to the cold inflation pressure shown on the Tire and Loading Information Label. See Loading Your Vehicle on page 250 and Inflation - Tire Pressure on page 337. The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. See Scheduled Maintenance on page 391. Tire Inspection and Rotation Tires should be rotated every 5,000 to 8,000 miles (8 000 to 13 000 km). Any time you notice unusual wear, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 341 and Wheel Replacement on page 346 for more information. Non-Directional Tires When rotating non-directional tires, always use the correct rotation pattern shown here. 339