Geo PRIZM 1993 Manual page 245

Inflation
-
Tire Pressure
The Tirehading Information label
which is in the glove compartment
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.
k
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:
Too much flexing
Too
much heat
Tire overloading
Bad wear
Bad handling
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 P a ) .
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.