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Different countries have different methods of rating octane. There's Research method and Motor method. USA uses R+M/2. So in Michigan we typically have a choice between 87,89, and 93.

The Research method is much higher neumerically than Motor, so it sounds like Iceland uses the Research method.

You probably should be buying the highest number (99oct). Unless of course, folks in Iceland routinely top off there aircraft at the local filling station ;)
 
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