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There are a lot of confusing comments in this thread.
First off, my Ninja 250 saw almost a 10% decrease in fuel economy between 87 octane and 94 octane. Take it for what its worth.
Octane is a measurement in fuels of the resistance to preignition. Octane rating has nothing to do with the BTU output of the fuel.
If your motor can run 87 octane without detonation, you will see NO benefit from running 93. (mainly naturally aspirated motors with low compression.)
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