Is there any scale of 'dryness' when it comes to different fuels? We all read how this fuel is dryer than that one but having a quantitative value as a point if reference would be helpful.
the answer you are looking for is probably way above most members pay grade here.
I will give you my "calibration" take it for what it is... a best guess at that.
1) the "fuel" must pour easily at room temperature. water pours easily at room temp. if it passes that test, go to #2.
2) wetness to dryness is gauged by dipping your fingers in and rubbing your fingers together. if it is "slippery" or "oily" then it is wet.
if it feels like it has no lubricating value, ie like water, then it is dry. if you are in a colder climate and are concerned about the fuel being
too "dry", then add ATF or two stroke oil to make it "wetter"
3) if the fuel doesn't pour easily at room temp, use less of it in your tank so the other fuels can break it down easier. you will need to experiment on a much smaller scale to determine what works for you.
4) if these guidelines don't answer your questions, you'll need someone who has a PHD in Chemistry to be able to give you the numbers you need. bottom line, mixing fuels is not an exact science but more of a guessumation and experimentation of what works for you in your situation and climate. your results will vary.