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87 vs 91 (or 92) Octane?
I sometimes drive my 2011 Honda Fit Sport 5M really hard on nearby twisty mountain roads, constantly accelerating (with all its mighty 117 horses) to red line. So I plan to put in a couple of tankfuls of 91 octane (as high as it gets around here), to see if I can feel a difference.
Now, what do you think, and why?