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so if we know the abv and FG , say 14%abv, FG = 0.990, let 0.8 = gravity ethanol 0.14 x 0.8 = 0.112 + 0.86 x 1 = 0.86 ~= 0.972 but FG is 0.990 does the difference, 0.018, give us RS(residual sugar)?