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I have cylinder deactivation on my 2013 GMC Sierra Z71.
Instant readings 18 mpg disable, and 24 mpg enable.
I wish GM would of made it more usable in a broader range then they did. It's only comes in at very very light load. When activated it does help with fuel mileage. I could see it working great in areas where the terrain is very flat.
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Pressure Gradient Force
The Positive Side of the Number Line
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