I usually have a 5 gal jerry can with me on long trips, or trips into the back country. I'm reluctant to run it to empty though for a couple of reasons. 1, it starves the fuel pump which could damage it, and 2, with the age of most of our Trackicks, there's probably quite a bit of sediment in the bottom of our tanks which I don't want to draw into the fuel system. Better to keep some in it , imo.