Active Fuel Management™ Technology
With Active Fuel Management™ technology from GM, the Vortec 5.3L V8 engine standard on LS 4x4 models and all LT and LTZ models delivers power when you need it.
- In situations where extra power is not needed, such as cruising down the highway 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: the next-generation Vortec 5.3L V8 is more efficient in providing the energy to move the vehicle when only four of the eight cylinders are operating.
- The powerful 32-bit engine control computer triggers cylinder deactivation based on inputs from vehicle sensors — making deactivation almost undetectable.
- Active Fuel Management™ technology helps the 2008 Tahoe equipped with the Vortec 5.3L engine deliver an EPA estimated MPG of 14 city, 20 highway for 2WD models and 14 city, 19 highway for 4x4 models when running on gasoline. That means driving range of up to 520 highways miles on a single tank of gas in 2WD models.
- In addition, exhaust-noise silencing measures and revised powertrain mounts add to the engine's overall smoothness.