GMC 2003 C4C042, Owner'S Manual, Page: 313 / 386

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Inflation -- Tire Pressure
The GVW Rating label, which is on the driver’s door,
shows the correct inflation pressures for your tires
when they’re cold. “Cold” means your vehicle has
been sitting for at least three hours or driven no more
than 1 mile (1.6 km).
NOTICE:
Don’t let anyone tell you that underinflation or
overinflation is all right. It’s not. If your tires
don’t have enough air (underinflation), you can
get the following:
D Too much flexing
D Too much heat
D Tire overloading
D Bad wear
D Bad handling
D Bad fuel economy
NOTICE: (Continued)
NOTICE: (Continued)
If your tires have too much air (overinflation),
you can get the following:
D Unusual wear
D Bad handling
D Rough ride
D Needless damage from road hazards