As you can see the difference is often very minimal, and not worth the effort
Not sure about that
My VS0 at gross is 47MPH at 2400lbs when i fly light the empty weight is 1440 lbs, I am 200 lbs and 20 gallons of fuel at 120lbs for a total of 1760 lbs, which is 640lbs under gross. If indeed the 1 MPH per 80lbs is correct my stall speed should be 8 MPH slower, which is significant especially when 3 pointing a taildragger