Hear,hear leadie,
back in the dim distant past you never had enough fuel....unless you were on fire!!....so how much fuel is enough??...you cannot possibly allow for every contingency, just make intelligent assessments based on historical statistics.
I think the question should be why? given Australia's lack of tarmac we dont have CAT 111, I mean it was available back in the seventies...what year is it now?...maybe one day australia will catch up with the third world.