[Bend-Lure]

Here is what I have heard lately. E10 can absorb half of one percent of its volume in water (0.5%). If you have 100 gallons of E10 fuel then you could add up to 1/2 gallon of water to the tank, the water would be absorbed by the E10 and you would be fine. Any more water and the fuel "Breaks" meaning that the fuel seperates and the saturated ethanol sinks to the bottom of the tank. This then gets sucked into fuel lines, filters etc and causes problems. Once the fuel "breaks" there is not way to fix it other than pumping out the tank.

I have a 150 gallon tank. If I leave 20 gallons in the tank all winter and one tenth of a gallon of water (condensation) mixes with the fuel then I have a problem. If I fill the tank up, it would take three quarters of a gallon to reach saturation, and there would be less air in the tank to create the condensation. I guess I am going to fill the tank, unless someone can talk me out of it.