This is very true, but at the moment I am running Shell V-Power plus +4 Ron Octane additive - I know they are tuned for 100 ron.
But yes very true, in the long run i really really need a Nistune board + Dyno in my life but cant justify the £400+ for that setup just at the mo. But dont get me wrong, it will be happening.
godzilr - Mines in the UK go for around £150 GBP, whatever that may be in Australasia.