Aarong is right, there are 2 refineries in Brisvegas, 2 in Sydney, 2 in Melbourne and 1 in Perth. Most of the 95 and 91 RON fuel for each state comes from these same sources, i.e. if you buy from a Caltex in Perth then most likely it was refined at BP's Kwinana complex. 91 and 95 is simply made to the Australian Standard and all companies use it in each location because value adding and branding is just not economically viable for such a price sensitive product. Wheras for the Premium 98 fuels each company has its own specs and tries to set themselves apart for their 'flagship' products.
BTW. Perth people should have a broader choice soon with Caltex now shipping Vortex98 over there.
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