Interesting article but some things left out. Ideal mixture of air to gas (stoichiometric) is 14.7:1, E10 is 14.04:1, E85 is 9.75:1 and as an aside diesel is 14.6:1. Along with E85 comes the need for a wide band O2 sensor(s) and higher flow injectors. As you can see the more ethanol added the lower the gas mileage. Because of the caustic nature of ethanol other parts of the fuel/engine that were not designed for it will suffer. I guess in today's world we must continue to dilute gas in order to have some in the future.