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Brazilian flex fuels gasoline and alcohol with several content mixtures doesn’t phase separate. Why would NA fuels do? What lacks on former fuels to phase separate, ketones?

24 June 2016

The high alcohol level in flex fuel pulls the water into the fuel and holds it tightly. Pure alcohol and water will mix to form a clear uniform solution in all concentrations. North American fuels contain only about 10% alcohol, so most of the fuel is hydrocarbon. A small amount of water will mix clearly into the alcohol and be held within the fuel, but as the water percentage increases, the alcohol-water mixture becomes less soluble in the fuel and forms a separate layer.