Back in the college days before I drank coffee, it was Pepsi Big Slams and No Doze for the long road trips. However now I have the motivation of keeping a family alive rather than abusing caffeine.
In this part of the country I look out for Pilot or Spinx. Pilot has coffee that will pin your eyelids to your forehead. QT is creeping up the list slowly at a close third, my kids love their brain freeze producing slushies. For me, as long as I can remember I would choose a Pepsi product, Slim Jims and white cheddar popcorn. Maybe some Doritos now and again. One of the biggest problems about eating chips in the car is there is never enough roof clearance to tilt the back up and drink the crumbs.