If staying on the routes identified by the Mile Post, what is the minimal fuel range you would consider being required? And which route would be the worse case?
If you can go 200 miles on a tank you should be able to find gas on any route. You may pay thru the nose for it, but you can get it. Also depends on how early or late you traveling. The earlier, April early May, or the later, after Sept 1, the stations start shutting down.