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Other truck had air suspension, which lowers on the highway, and was broken in, so less mechanical resistance in the engine. Apples to apples, I dont think it's 4 mpg. Maybe 2 but it's worth it to me for the better and drivability.
I have had the 3.92 locked rear diff from the factory in my 2014 Ram CC Hemi. It is available in gas and diesel trims. If you build a truck at ramtrucks.com, you will see that this is true. Please don't spread incorrect info.
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