Quote:
Originally Posted by Tokay444
Why non ethanol?
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Non-ethanol gas has anywhere from 15-20% more energy than typical ethanol gas. This is completely separate from the Octane ratings. The Octane ratings is more closely related to the ignition timing and running too low an Octane will result in the engine knocking. Where I live at 7000 foot elevation in Colorado, the lower oxygen content in the atmosphere allows for lower Octane without getting the engine knocking...so typical regular gas is 85 rather than 87, premium is 91 vs 93. Modern vehicles are designed for the crappy ethanol gasoline, so there won't be damage to them and you may not see much change in performance. I've only put premium in my recently acquired FR-S, so I couldn't tell you anything about my experience with running it on regular Octane gasoline. I do have a 2010 Goldwing and my gas mileage on that is a minimum of 20% better when running it on non-ethanol gas at the same Octane. I also have a 2017 Power Wagon and haven't noticed any difference between 91 Octane ethanol gasoline and 87 Octane non-ethanol gasoline--the price is about the same here between the two.
An additional effect of driving at 7000 feet is a roughly 20% loss of horsepower for a naturally aspirated engine. A turbocharger does better at altitude than a supercharger, but it is what it is.
Two cycle yard equipment really prefers non-ethanol gasoline.