10-31-2020, 01:24 PM
In 40 years I never had "bad gas" out of spring storage without fuel stabilizer. However, I always fill storage to the top to minimize surface exposure to oxygen, and top tier brand name regular and mid grade fuel was used. I have used vanilla stabilizer, but quite inconsistently (vs. nothing) in lawn mowers. They never failed to start in spring, typically on the first pull, full choke.