Maybe funnier still - I have no intention of trying it either.

This is part of operating procedure for aircraft running pump gas. The test for ethanol is to add water to a sample of fuel in a graduated vial and see if alcohol settles out with the water. If it does then you can measure more water than you added.

I put 100% gasoline in a car recently by brain fart and it seemed to get much better mileage. The odometer wasn't working so it is speculation.