Ethanol in gas does not cause injector failure. It's the water in gas that is the issue. Gas additives include demulsifiers which cause the water to separate out of the pure gas. Water will settle to the bottom of the storage tanks at the distribution facilities. Ethanol and pure gas is then blended into the tanker trucks for delivery. Thus, there should be virtually no water in the E10 delivered to the retail stations. However, ethanol is hygroscopic and will absorb water and perhaps too much if left in tanks too long. The effect of too much water is that the gas, ethanol, and water will separate into layers in ones tank which is not good.
IMO, to minimize the possibility of potential separation of gas, ethanol, and water in your gas tank, 1) always buy gas at high volume stations and 2) keep your tank as full as practicable. Problem is you could still get "bad gas" and not know it until a problem arises (injector failure).
Having said the above, I don't know anyone that has had an injector failure since the introduction of ethanol. Also, there is nothing wrong with ethanol absorbing small amounts of water. The water molecules simply pass through the fuel system. Although pure gas can absorb very small amounts of water, it's not significant compared to ethanol. But, a tank of bad pure gas is likely to be detrimental to the fuel system also.
Edited by Plus 3 Golfer, 08 August 2018 - 06:47 AM.