Hang on a sec, Ive been reading this thread thinking what's this 100RON fuel you guys are talking about?
Baz, the 100RON isnt E10 is it? All the E10 in these parts is advertised as 91RON (Shell E10 is actually 94RON though). It's the cheapest unleaded fuel at the bowser in NSW and there's plenty of supply around. I fill the Nimbus up on it all the time and find it runs pretty good on it, better than normal unleaded IMO.