Ethanol/water.....distill it and put the ethanol in your car in small batches and burn it.

One other thing, I would stabilize the gasoline using Stabil or other products.   Present gasoline seems to gum up valves if it
sets for a while.  We had a case of that happening at our local community college auto restoration programp; it caused several bent push rods and took a lot of Seafoam to clear.