E85 fuel flexing

[Umbra]

Had a question for california drivers. I got my honda hatch sport with the TSP stage 1 Ktuner flash and have been just running 91 premium since that's the highest octane we got, but have been tempted to mix a couple gallons of e85 or 100 unleaded with the 91 to make a 93 octane. I don't have an e85 fuel flex kit but have read I don't need one to blend so long as I only use a couple gallons. Just wanted to see if anyone has done this and see if its worth exploring. Any advice would be nice.

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[Kotaas]

Wouldn’t go past 1.5 gallons that’ll keep knock control low. I was doing that when I was on tsp 1. There’s a reason why we need a flex fuel kit to run ethanol