Why don't you contact the Fuel and Energy group at the ATO and see about getting an excise permit to make your own ethanol? You just need to be able to tell them exactly where is it and where it is going at all times, and need a premises with a dangerous goods license iirc.

They are quite friendly people and will go out of their way to try and help you in my experience. The only hard part is trying to find the right person to talk to, and explaining exactly what you intend to do.

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