I think that gasoline diluted with ethanol is one of the most pervasive examples of how the wealth has been stolen from us.
There are multiple ways to view it, but the simplest way to think of it is that folks spend more currency for less gasoline at the pump.
The price of gasoline changing doesn't matter if it keeps getting diluted. The real price of gasoline is the 100% pure stuff. Bucc-ee's tends to have it for less than $4/gal, but most stations sell it for $4/gal and up. Plus, it's an effort to find it. Most gas stations sell only adulterated gasoline.
Just my two cents.
You put the gas into a container, and add about 1 cup of water per gallon of gas.
If you shake it vigorously and let it settle, the gas will be on top and the water-ethanol on the bottom. You can pour the gas off the top or whatever.
If you want to extract the ethanol from the water-ethanol mixture, a good and easy way is to do the same as above but use salt instead of water. If you put epsom salt on a baking sheet and heat it up in the oven, you can use that instead of salt as it is more effective. When you decant the alcohol layer on top, it will be extremely pure.
You could also put the water-ethanol mixture in a distillery, if you have one.