2007 GMC Savana Van Owner's Manual - Page 350

Dual Tire Operation When the vehicle is new, or whenever a wheel, wheel bolt or wheel nut is replaced, check the wheel nut torque after 100, 1,000 and 6,000 miles (160, 1 600 and 10 000 km) of driving. For proper wheel nut tightening information, see "Removing the Flat Tire and Installing the Spare Tire" later in this section, under Changing a Flat Tire on page 360. Also see "Wheel Nut Torque" under Capacities and Specifications on page 393. The outer tire on a dual wheel setup generally wears faster than the inner tire. Your tires will wear more evenly and last longer if you rotate the tires periodically. See Tire Inspection and Rotation on page 351. Also see Scheduled Maintenance (Gasoline Engine) on page 399. {CAUTION: If you operate your vehicle with a tire that is badly underinflated, the tire can overheat. An overheated tire can lose air suddenly or catch fire. You or others could be injured. Be sure all tires (including the spare) are properly inflated. See Tires on page 340 and Inflation - Tire Pressure on page 348 for more information on proper tire inflation. 350