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I run 87 octane with no additives almost exclusively, with the only alteration being an occasional tank of 89 or 91. (we're talking once a season occasional)
Done it for a few years when on L-jet, still do it on SDS and ITB's.
No damage, no change in the way it runs, no nuthin other than saving a few bucks at the pump.
In reality you don't need the higher octanes until you get into higher compression ranges, and unless you've done something to increase yours, the stock compression will run just fine with the low grade stuff.
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