Chevrolet 2002 Prizm Owner's Manual page 93

Overdrive (Option) If your automatic transaxle has an overdrive off button it
will be located on the left side of the shift lever.
Press the overdrive off button to turn off overdrive.
A light on the instrument panel cluster will come on
when this feature is used. Press the button again to turn
overdrive back on. Then the light on the instrument
panel cluster will go off. See "Overdrive Off Light" in
the Index.
Use this feature for better fuel economy. Fast starts
use the most fuel while gradual starts give you the best
fuel economy.
When you turn on your vehicle the overdrive will
automatically be on until you turn it off.
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