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What is the highest octane i can put in my harley davidson?

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What is the highest octane i can put in my harley davidson?

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  1. There is no reason to go over what the manufacturer requires. Mine is a tc88 and requires 91 octane. I use 93 because that's what's available.


  2. 91 or 93 if you can find it

  3. They'll run on anything.......try peanut oil!!

  4. regular unleaded for that dud

  5. There's no limit to how HIGH you can go.

    ===

    Octane rating does not measure gasoline's energy content, quality, purity, etc.  It only measure's resistance to self ignition (detonation).

    But for the same reason you really don't need to go higher than what is recommended.

    Good Luck...

  6. 93 is plenty.

  7. What ever the owners manual says. Putting in higher octane than required does nothing but empty your pocket faster
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