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Pretty accurate JMROD.
To add to it, the a higher octane fuel NEEDS more pressure/heat to burn clean. So if your engine is NOT running well with higher octane in it...it probably doesn't need it.
If you're 1983 Honda doesn't run well with 87 so you have to put higher octane in it, it's not because the higher fuel is better, it's because something in your engine is broken and needs to be tuned.
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