Turns out I can't even get E85 [which is what I think would work] here in SA. I spoke to someone who works in the petroleum industry and E85 is currently only available [via big-name agents like BP, Shel etc] in VIC and NSW.
Unless I run BP Race Fuel which is rated at 110. I don't think that's very practical though.
The highest ethanol blend available via pump is E10 and maybe E20 here in SA, unless I get ahold of some to mix in myself.