Try THIS LINK
Lots of information on search engines about gasoline/petrol storage and shelf life.
Here is one pretty good article
And I'm sure you will find many more.
I think a better plan would be to seek alternative modes of transportation and sustinence, rather than stockpile gas or oil. If you have a large
quantity of gas/oil stored up, I would suspect people will be willing to attack/steal/kill to get possession of it (making it very risky, and
potentially useless to stockpile), if their lives are being interrupted to a degree that they are fleeing cities. But that's just my opinion.


I was after members experiances with such products, not a smartass answer. 