100g isn't to bad to store, 50g wouldn't be bad either.
I have a designated generator room, enclosed, and plan to insulate it actually too. Additive should be used anytime it's not going to be used right away IMHO. I agree, diesel is NOT For everyone, I live Rural, and can store it... so I know 50g or 100g is not that much esp after I get my tractor *Dreams* hehe.

-Todd