It's probably posted somewhere else on here, but the numbering systems for octane are not the same in Europe and the US. Our numbers are much lower (typically, 87, 89, and 91) than yours, but when you convert them they work out to be the same. Ours is RON+MON/2 (Research Octane Number + Motor Octance Number divided by 2). I believe Europe just uses the RON. So, to summarize, it's the same stuff just measured and notated differently. |