I have run the pure gas and the 10% ethanol 93.....the engine can run great on either, but there is a little bit of carb tweaking needed.
I watch the air fuel ratio close on my meters so I can tell the difference. Purse advantage is a higher boiling point or distillation curve....sometimes that will matter to you.
Octane is a chemical mixture with one property only, it reduces knocking which if the fuel igniting by compression and not from the spark plug.
The chemical octane when added to gas reduces that property. Our cars have higher compression ratios. 9 to 11 generally, so what the compression is also effects how much octane you need.
Octane is not power and adds no power. Ethanol gas actually has more octane than pure gas, but ethanol gas has lower energy in the same volume than pure gas. So the easiest way to get octane is with what is available at the pump, ethanol 10% is here 93 and should be easy to get that or 92 where you are.
I would recommend going with one or the other, pure or 10% ethanol and tune in your carb and donít switch back and forth. I have run them both, I now run the 10% pump gas easy to get everywhere at 93. I got tired of chasing down pure stations and frankly some of those had water in their tanks and were off the beaten track.
I drive a bit around and like the ease of pulling in anywhere and getting good fresh gas.
I add Redline S1 as a fuel system cleaner and octane boost, and Stabile 360 Marine for phase separation,....see my other comments in todayís posts on those additives.
I just cleaned my fuellab filter yesterday, but did not have to do anything because it had zero dirt or contamination after thousands of miles. Ethanol is a cleaner in itself...
So a few ways to go!