Sorry if this is a dumb question, but why do the instructions on the planes I have put together so far specify balencing for the center of gravity with an empty fuel tank? I know that the plane will be easier to handle in the air nose heavy (ie with fuel in the tanks) but lets say 99% of the time I land under power (fuel remaining) then wouldn't it be better to set the CG with a little fuel in the tanks for a good balence on landing (actually, why not slightly tail heavy on landing with a taildragger)?

Adam