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VVT + AFM + MPGs for GM V8s

Did you ever wonder how the 5.3-liter Chevy Silverado* does so well in fuel economy ratings—15 mpg city, 22 mpg highway—especially in the “May the Best Car, er, Truck Win” ads against the 4.6-liter Toyota Tundra (15/20 mpg) and 4.6-liter Ford F-150 (14/20 mpg)? Well, while there are undoubtedly a multitude of reasons, here’s an important one: variable valve timing (VVT). Key to the truck VVT system is the electrohydraulically controlled cam phaser, which controls the cam position based on input from a sensor and is controlled by the engine control module.
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Did you ever wonder how the 5.3-liter Chevy Silverado* does so well in fuel economy ratings—15 mpg city, 22 mpg highway—especially in the “May the Best Car, er, Truck Win” ads against the 4.6-liter Toyota Tundra (15/20 mpg) and 4.6-liter Ford F-150 (14/20 mpg)?

Well, while there are undoubtedly a multitude of reasons, here’s an important one: variable valve timing (VVT). Key to the truck VVT system is the electrohydraulically controlled cam phaser, which controls the cam position based on input from a sensor and is controlled by the engine control module.

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Oh, and the cylinder deactivation (a.,k.a., “Active Fuel Management,” AFM) doesn’t hurt, either.

GM is now using VVT across the board in its truck V8 lineup (4.8-, 5.3-, 6.0-, and 6.2-liter engines).

*And the GMC Sierra, too.

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