The C.205 used to have no range, but it definitely does now. You have the AUX tank, the MAIN tank, and the wing tanks. Are the wing tanks new? If they're not new, then ignore what I just said, but I used to think the exact same thing Fester. It took me messing around with the fuel selection to find the wing tanks (because I always used to RTB when the main got low).
Beeker