Chevrolet 2007 Colorado Owner's Manual page 128

Up-Shift Light
When this light comes on, you can shift to the next
higher gear if weather, road and traffic conditions
permit. For the best fuel economy, accelerate
slowly and shift when the light comes on.
While you accelerate, it is normal for the light
to go on and off if you quickly change the
position of the accelerator. Ignore the shift
light when you downshift.
128
This light will show
you when to shift to
the next higher gear
for best fuel economy.
If your vehicle has four-wheel drive and has a
manual transmission, disregard the shift light
when the transfer case is in four-wheel low.
For more information, see Up-Shift Light
(Manual Transmission) on page 189.
Shift Speeds
CAUTION:
{
If you skip a gear when you downshift,
you could lose control of your vehicle.
You could injure yourself or others.
Do not shift down more than one gear
at a time when you downshift.