I have access to a couple of sealed barrels, marked expiration of May 2021. To get any fresher fuel requires shipping barrels to the middle of the Pacific. Everything I've read suggests that this shouldn't be an issue; it lasts for many years when sealed. I used AVGAS in Resolute Bay that was 1 year nominally expired, with no issues. I'd be interested in the experience and views of those on here, as to whether my intention to use it is a good idea or not.