I have a .65 O.S. powered trainer with 14 oz fuel tank. I have read everywhere that you balance the plane at the COG with the fuel tank empty.
My tank, like almost all, is located right behind the firewall and of course ahead of the COG balance point.
Just wondering since you (hopefully) land without your fuel tank empty, maybe 10-25% fuel left, that maybe it would be better to fill tank with around 20% of capacity and then balance it, since it would better represent COG at landing....or am I getting to particular and maybe it should not matter that much.....any thoughts?