Having lived and worked in many remote parts of Australia, I've never seen the need or availability of chip oil or waste oil as a viable "stuck in the outback"fuel option it just doesn't happen or exist.
If there is any form of civilisation, you will typically find a drum of jet fuel. I'll carry a small bottle of 2 stroke in my remote touring kit to add in the event I had such circumstances to render my fuel state critical.
The only circumstance in Oz where you "need" to involuntarily contemplate muck fuel ( veg, waste etc) is nowhere.
If you can find anything to burn as fuel and the means to filter it to be viable then a more conventional fuel would have been available anyway.

