Well, I know the tank is completely empty becuase i havn't flown it yet. Im at the stage to double check the CG before the first flight. Yeah i did notice that I typed in the wrong CG on the orginal post. I personally am really confused because I triple checked the mesurement on the greatplanes CG machine. I guess its from the excess expoy but, that much? I konw i did use a good amount on the wing halfs to make sure they are strong. But that is right above the CG so it shouldn't be much of a differance.