Sheetz has their 15% corn juice 88 octane for $1.99/gal everywhere. That stuff gets the same MPG as any of the other ethanolized fuels in our vehicles, so I am happy.
Ethanol has lower BTU content than gasoline.
Maybe you can't measure the difference.
I'm sure you aren't scientifically doing it.
Weighing the car to get the exact same amount of fuel every time.
Driving the same route in the exact same conditions and driving
exactly the same.........
So your calculations don't show it.
Ethanol can make more power out of a same engine.
Ethanol brings some oxygen to the party. That extra oxygen can allow
more fuel to be burned in a cylinder. Making more power.
But. And a big BUTT.
They key is "more fuel to be burned".
Alcohol race engines will burn twice the volume of fuel that a gas engine uses. Carb jets are usually doubled as a starting place.
Recently read a post of a guy claiming that gas gave him 3 mpg better in his pickup.