George, I don't understand why you bring octane into the discussion. Unless you happen to have a variable-displacement test engine, you can't accurately measure the octane of your mix. At any rate, the actual octane is pretty much irrelevant in your Kohler engine, which is designed to run on regular gas. And if your intention is to clean out the combustion chamber, I'd think if anything you would want to go with a lower octane.
You also don't know precisely how much ethanol is in your mix. E85 can contain UP TO 85 percent ethanol, but it can be and typically is less. Likewise with E10. So it might be that winter grade E85 has less ethanol in it than your mix of summer grade E85 and E10.
OK, so your real intention is see what happens when you oxygenate your fuel. Yes, I'd expect the oxygenated fuel to burn a bit cleaner. But aren't you also lowering the combustion chamber temprerature with your gasohol, which defeats your purpose of carbon removal?
Auto manufacturers have struggled with carbon deposits, and their solution has been "Top Tier" fuel, which is certified to have a certain level of detergency. Maybe you should give that a shot.
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