Active Fuel Management™

---

With Active Fuel Management™ from GM, power is delivered when you need it.

• The next-generation Vortec 5.3L (standard on 2WD models, available on 4x4 models) and 6.0L V8 engines (available on 3LT and LTZ models and requires Autoride Suspension, 4.10 rear axle ratio; not available with Z71 Off-Road Suspension Package) transition seamlessly from eight cylinders to four cylinders and back again, making them both powerful and efficient. In addition, the Driver Information Center displays a message, notifying the driver of this transition.
• In situations where extra power is not needed — such as cruising down the highway or on level roads — Active Fuel Management™ deactivates four of the eight cylinders with seamless precision.
• When load demands increase — such as when the vehicle accelerates or travels uphill — valves are reactivated to provide eight-cylinder operation.
• The bottom line: These next-generation Vortec V8 engines are more efficient in providing the energy to move the vehicle when only four of the eight cylinders are operating.