That's all right. Your fuel is graded using the Research Octane Number (RON) only. In the States, we also grade fuel using the Motor Octane Number (MON) and then post the average of the two: (R + M)/2. MON will always be about 8-10 points below RON. So, your 91 octane gas is pretty close to our 87 octane stuff and your 95 octane gas is equivalent to our 91.
I'd use the American values (87 and 91) on the order form to avoid confusion.
Hope this makes sense.
- Jack
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