We have taken to eating loads and loads of beef jerky when we get in the car. It has an infinite shelf life, is very filling, and, if prepared properly, takes a hell of a long time to chew. On days when you can't fall asleep in the Suburban, and you forgot to bring something to read, and you're done goofing on other bands' literature where they repeat thier mantra "we play hard and we party hard, too!"... the hypnotic satisfaction of the masticatory monotony of chewing beef jerky is not only satisfying, but sometimes is the difference between maintaining your sanity on that 4 hour trip to Wherever, TX, and going completely bat-shit insane.