Ford Probe Owner's Manual page 156

Upshifting
For normal acceleration, you should upshift at
the following speeds:
For cruising, you should upshift at the following
speeds.
Downshifting
When you slow down or climb a steep hill,
always downshift before the engine starts to lose
power. Downshifting reduces the chance of
stalling and gives your vehicle better acceleration
to increase speed again.
When you drive down steep hills, downshifting
helps you keep a safe speed and helps prevent
unnecessary wear on the brakes.
When you come to a stop, do not downshift
through each gear. Disengage the clutch and use
the brake as necessary. Downshifting through
the gears decreases your vehicle's fuel economy.
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