If you go through the OCAU thread, u can see that this reports is actually an unfinished draft that was leaked.
I've heard some dyno operators in SA are recommending the ethanol blends for maximum power, but cars must be tuned to suit the fuel. Don't know how accurate these rumours are, so treat them with a grain of salt.
I don't think I'm game to try anything else unless I know for sure it won't affect longevity in my car. Ultimate is consistent for me, the cleanest of the lot, and I have enough power as it is at the moment
I wonder where SA gets its fuel from and which would be the most "fresh" fuel. Anybody know?