I thought all our Avgas had come from Singapore for a number of years now?? The quantity is so low now that producing Avgas in Oz would not likely be justified.
Back when I was doing my Flying training (early 80's) I was informed that at that time Australia was a 'net exporter' of Avgas. We then had a refinery or refineries that produced more than the Country needed so the excess was exported.
Anyone else remember that back in 1998/9 Avgas was cheaper by about 4 to five cents/litre than 92 Octane Unleaded?
I do, because I then had a Toyota Celica with a worked Twin Cam engine, and Avgas was the only stuff I could run in it without the engine pinging!
G'day
Griffo.