Chevrolet 2002 Corvette Owner's Manual page 90

Shift Speeds (Manual Transmission)
CAUTION:
If you skip a gear when you downshift, you could
lose control of your vehicle. You could injure
yourself or others. Don't shift down more than
one gear at a time when you downshift.
This chart shows when to shift to the next higher gear
for the best fuel economy.
2-32
If your engine speed drops below 900 rpm, or if the
engine is not running smoothly, you should downshift to
the next lower gear. You may have to downshift two or
more gears to keep the engine running smoothly or for
good engine performance.
NOTICE:
When you are shifting gears, don't move the
gearshift lever around needlessly. This can
damage parts of the transmission and may
require costly repair. Shift directly into the
next appropriate gear.