Just changed employers two weeks ago, so I don't drive the D/A nearly as much. (Take the Train and drive the little car, D/A won't fit in the parking garage very well) Any how.....I had some extra fuel in two new 5 gal. containers from my camping trip. (3 weeks in new containers) How long can I store xtra fuel w/o the worry of algie build up? I put it in the truck today so should I refill the containers to keep them clean/algie free?