We have a lot of stations in Oklahoma that sell pure gasoline and ethanol/gasoline, usually 10% corn. Usually, the ethanol product is about 8-10% cheaper per gallon compared to the lowest grade of regular gas. Where I buy most of my gasoline, the ethanol mix is 89% octane, the full gasoline is 87, 89 or 90.
So, do I buy 10% ethanol, 89 octane, this morning for $3.29 or do I buy 87 octane pure gasoline for $3.49 or 89 octane pure gasoline for 3.69??
Complicated, ain't it :D
I decided on the motorhome it is better to just buy the pure stuff and not worry about it. Yes, I think the Ford V10 runs better on the pure juice. Mileage? I have heard that argued and a lot of math for a lot years. On my Jeep GC, I usually use the ethanol and it runs fine.
By the way, my first experience with an ethanol refinery was in Kansas thirty years ago. The farm states politically keep it in place. Here in Oklahoma, we don't grow much corn. But we grow a lot of oil!
PSW