100LL stores poorly.
I don't know where you're getting that information. I have used 100LL that was well over 3 yo with no problems.
Note, if you use any leaded fuel in a catalytic equipped vehicle, it will coat the converter and prevent it from doing what it does.
TurboZamboni, only use tightly seal-able, strong metal containers if storing fuel in high temp climates.
What issues are there with storage?