2009 GMC Canyon Extended Cab Owner's Manual - Page 108

Up-Shift Light This light will show you when to shift to the next higher gear for best fuel economy. Shift Speeds { CAUTION: If you skip a gear when you downshift, you could lose control of the vehicle. You could injure yourself or others. Do not shift down more than one gear at a time when you downshift. 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. If the vehicle has four-wheel drive and has a manual transmission, disregard the shift light when the transfer case is in four-wheel low. Four-Wheel Drive If the vehicle has four-wheel drive, you can send the engine's driving power to all four wheels for extra traction. To get the best performance out of four-wheel drive, you must be familiar with its operation. Read this section before using four-wheel drive. You should use two-wheel-drive high for most normal driving conditions. Notice: Driving on clean, dry pavement in four-wheel drive for an extended period of time can cause premature wear on the vehicle's powertrain. Do not drive on clean, dry pavement in Four-Wheel Drive for extended periods of time. 2-26