Mercury 1996 Sable Manual page 149

NOTE: If your speed increases above your set
speed while driving in j (Overdrive)
on a downhill grade, you may want to
shift to D (Drive) to reduce vehicle
speed (or, turn j [Overdrive] off by
depressing the O/D OFF switch on the
gearshift lever). The speed control
cannot reduce the vehicle speed if it
goes above your set speed on a
downhill grade. For the best fuel
economy during normal driving
conditions, leave the gearshift in j
(Overdrive), or resume as soon as
practical.
To keep control of your vehicle, do
not use the speed control in heavy
traffic or on roads that are winding,
slippery, or unpaved.
Accelerating With the Speed Control
Operating
You can use the accelerator pedal to speed up
momentarily. When you take your foot off the
accelerator, the vehicle will return to the set
speed.
NOTE: When driving in hilly terrain, at high
altitudes, or when pulling a trailer, you
may want to drive in D (Drive) (or
turn j [Overdrive] off by depressing
the O/D OFF switch). This will
improve speed control performance.
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