Got one figure, yesterday, that may help. With mods listed two posts back, on interstate, not towing, AC off, windows up, tailgate on, no appreciable wind, traveling at 66MPH on relatively flat road, I was seeing 18+. Keep in mind this is a 4x4 dually, with 2" Fred's dually spacers and wider and more aggressive tires than stock.
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Big Okanagan on a big 4x4 Ram 5500.
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