its not good to have it stored.. plus its bout $30 a gallon.. and there is 6 to a case.. bout $180 plus shipping and insurance(remember its a flamable gas!!) so far your up to bout $240...and if you buy quarts you will be wasting evan more money.. plus the only way to order straight from the manufactorer, is if your a dealer.. so far it doesn't sound like any fun.. I'm leaning towards just picking up 2 gallons from the hobby shop, and that should keep you going for bout 2 months...
you can keep it for months if you keep it in a dar,k cold place...
heat ruins the alchohol content...
so keep it in the corner of a hall closet or somewhere where it is cool and dark.
if you just let it sit there you could get like 2 - 3 months before it starts to get a bit stale.
but if your using it i think youd run out faster that way and probly just from use be gone in a month or so, maybe a bit longer depending on how long and often you run your truck...