BTW: I should have clarified.

Normally pusher plane C.G. is affected adversely with a FULL tank.

In other words filling the tank moves the C.G. BACKWARD ( bad ), while in a regular tractor plane a full tank moves the C.G. FORWARD ( good! ).

The C.G. for this plane is given with an EMPTY tank, but in reality it should also be checked with a full tank to make sure the C.G. doesn't move TOO far back in this state.