Anyone should realize by now that E10 used for small engine usage must be stored in air tight containers & used with a month unless a form of fuel condition is utilized . I never store E10 or E0 for more than 3-4 months . You repair enough small engine units & you see the downside of improper fuel storage & usage .Nearly all organic compounds have a shelf life. If you will not use up the item prior to the end of it's shelf life then just do not buy more than you can use and do not whine about the effects when you do. Folks cannot seem to take responsibility for their own mistakes.