Easy to remove ethanol from gas, just takes water (and a bucket and siphon, ideally). I and other have posted on this forum, or do a Google search - there are youtube.com videos as well.Ethanol is hi octane, they reduce the octane of the remaing petrol the more they add to retain the octane. Pure ethanol is 109 octane. But ethanol has lots of other issues, enough to use ethanol free if you can get it.