hey OZ- your octane ratings are a little different than ours. I dont remember all the specifics, but being a Subaru STI and WRC fanatic also, I read alot of their forums. Since the STI is a high compression, high boost car, all those guys have danced around back and forth to figure out why everybodys info about octane internationally is different. It all comes down to the math used to determine octane ratings in different places. I remember the US and Europe are different, but cant remember if you guys use European ratings or if you upside downers have your own!