Fishy68:
Here we go:
http://hondaswap.com/reference-materials/us-octane-vs-other-countries-octane-ratings-59435/
Long story short, multiply the European Octane rating by 0.95 and you get the US equivelant.
Therefore I am running a 90.25 Octane gas. Close to your basic US "Premium"
That being said we can obviously reverse the process to get the European equivelant of US rated fuels by dividing the US Octane rating by 0.95.
You guys running 89 Octane US, are running a 93.7 Octane by European standards.
Even longer story short, we're all running the same stuff. I seriously doubt international oil companies are refining US specific batches and Eurasia specific batches that only differ by 1 octane point roughly.
David