The E10 also does not store well. It is sucking H2o out of the air constantly. If you are concerned about being able to function in an event, consider aircraft fuel from your local airport. It keeps very well and is formulated for preventing vapor lock in air craft at altitude. It stores well for over a year when my local gas gives me problems in a month or two. Search for the fuel system design for the old Seagrave fire engines. They did not tolerate vapor lock. Lowell