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  1. 3.0L Duramax
    I have a 2020 Silverado with 3.0L Duramax, 4WD, crewcab. I took two trips when the truck had less than 10k miles on it. No mountains, no towing. The on-board computed highway mileage was 30mpg. A month or so later, I added a 2" lift via adjustable struts. No lift in the back. I also changed...
  2. 3.0L Duramax
    Anyone have a 3:73 rear axle ration? Wondering what the gas mileage will be compared to the 3:23 ration?
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