?? I had no idea that 'sealed' stagnant gasoline degrades by external forces.
@DCPatriot Yeah... It will not last long. Premium non-ethanol better than most - we use Conoco/Sinclair Premium here. It won't make the winter, for sure. You can use Stabil, or some other stabilizer, which does help. And if you were talking about 5 gallons, you could probably still burn it after 4 to 6 months... but 300 gallons... You get this gank on the bottom of the tank... When you first see that, you can cycle the pump back up into the tank to agitate it, and you'll get along a bit further, but you better start burning it up and get some fresh in there soon.
BTW...even though I've owned BMW M5 and M3 sports cars as well as Stingray corvettes back in the 60's, the most dependable vehicle I've ever owned was a 2012 VW Jetta Sport Wagen (sic) Turbo Diesel.
Put 225K miles on it with only oil and tire changes and a pair of brake shoes.
Diesel and kerosene are the only fuels left that keep - and I think only red diesel keeps well anymore. I think they are messing with the diesel for automotive purposes. What we have on hand is the non-taxed red diesel that you are not supposed to use in automotive.
I think that is on purpose, btw - I think they don't want folks to be able to store fuel.