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@ 21knts cruise you have calculated 1.6 NM per gal If working out my range on an F37 with 44s I would work on 1.4 mpg @20 knts I dont know the F37 intimately but I know the predecessor 350, 1.6 mpg @ cruise speed of 20 knts .........no chance I think most of us work in mile per gal or litters per mile |