Acura 2009 TL Owner's Manual page 518

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The transmission remains in the
selected gear (5, 4, 3, 2, or 1). There
is no automatic downshift when you
push the accelerator pedal to the
floor.
When you are driving in 4th or 5th
gear, the transmission downshifts to
the lower gear under the following
conditions:
The vehicle slows down to a
certain speed.
You press the brake pedal.
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Downshifting with the paddle shifter
allows you to increase the engine
braking when going down steep or
long hills, and provides more power
when climbing uphills. You can
upshift the transmission manually to
reduce the rpm. Driving in the
higher gear helps fuel economy.
The transmission also shifts
automatically as the vehicle comes to
a complete stop. It downshifts to first
gear when the vehicle speed reaches
9 mph (15 km/h) or less.
Driving with the Paddle Shifters
2009 TL
The automatic transmission will not
allow you to shift up or down if:
You downshift before the engine
speed falls below the upper limit of
the lower gear.
If you try to do this, the gear
position indicator will flash the
number of the lower gear several
times, then return to a higher gear.
If the vehicle speed decreases
below the redline of the selected
lower gear while the indicator is
flashing, the transmission
downshifts, and the indicator
displays the selected gear.
You upshift before the engine
speed rises above the lower limit
of the higher gear.
You pull both paddle shifters at
the same time.
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