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Hmmm,
Hard to believe those numbers JustLucky but I certainly like your detailed explanation for such results so I am going to believe it's possible and see what I can learn from it!
I have a 2003 RAM 3500 Long Bed 4x4 with manual 6sp and I do get the exact same figures you used to. I have no mods except for a Quadzilla Mileage Max that I have run for over a year now. I have always hand calculated my mileage since new and can certify that over a full two-year test, one with and one without Quadzilla, the difference has been absolutely zero on mpg. I have now on order a Smarty Jr that will enable me to dial in some fuel timing advance. Hopefully that will improve measurable my mileage. I am runing OEM size tires, 265/70/17 Pirelli Scorpio ATR and they will be replaced next summer with Michelin LT MS 2 like your but they need to be E load rated. You said you installed skinnier tires, what are the dimensions and what load rating are they?
Would you be able to give an estimated break down of how much mpg you gained from each of the mods. I would like to ne able to make an educated decision as to what I need to do next to my truck to reach my ultimate goal of 25 mpg on the highway at 65 mph. Not as aggressive as yours but my truck is a big 3500, has a fiberglass high top canopy, running boards, mud flaps, deleted front spoiler (off-road incident) the big towing mirrors, etc.
Any detailed info very welcome.
Diesel Fan
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