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Leon, the reason we go for the higher octane in the states is because it has lower ethanol content, most times. Now the way octane rating was explained to me- The fuel molecules are somewhat round, the higher the octane rating, the more round they are, the lower the rating, the less round. The...

As the other thread is delving into this, I figured I'd start a new thread. I run nothing but Royal Purple Synthetic in my saws, all I've run for over ten years. I mix it 45ish to 1 and every time I pull a cylinder they are nice and slimy inside! I've been very happy with this mix and zero...