We're pretty fortunate here, for the time being.. You can still buy 100% gasoline at the major oil companies pumps. Even a few major chain store gas pumps. They have stickers on the pumps..., 100% gasoline.
Speedway, Thornton, etc. have ethanol...
When recently hauling many, many loads of fill material for a new horsebarn and shop, I did a comparison of the fuels. I did get better mileage with 100% gas, and seemed to have a little more power pulling the same grade...
Another story for the "projects" thread some day...