Does having Marsden Pt operating stop us importing as needed?

Or is it that we did not really have much infrastructure for it because of refining locally, so couldn't beef up imports in a hurry?

Our fuel supply is no more fragile than any other country, I think.

Someone mentioned at the pub last night that the US drills and refines more oil products than it uses. Attacking the Middle East is a good way of driving up the price for those products, they don't even need the oil from the countries they attack.