Buick 1994 Century Owner's Manual page 241

Inflation
-
Tire Pressure
The Tire-Loading Information label which is on the rear
edge of 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 a mile.
I
NOTICE:
Don't let anyone tell you that underinflation
911
overinflation is all right. It's not. If your tires don't
have enough air (underinflation) you can get:
Too much flexing
Too much heat
0
Tire overloading
Bad wear
Bad handling
0
Bad fuel economy.
If your tires have too much air (overinflation),
you can get:
Unusual wear
Bad handling
Rough ride
Needless damage from road hazards.
When
to
Check
Check your tires once a month or more.
Don't forget your compact spare tire. It should be at 60
psi (420 kPa).
How to
Check
Use a good quality pocket-type gage to check tire
pressure. Simply looking at the tires will not tell you the
pressure, especially if you have radial tires
--
which
may look properly inflated even if they're underinflated.
If your tires have valve caps, be sure to put them back
on. They help prevent leaks by keeping out dirt and
moisture.
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