I, of course, ETS-trained, will have driven my food-laden vehicle as far as it would go on a tank of gas and then will be on a bike, riding with friends on bikes, pulling bike trailers laden with camping gear and food. When that food and all my cash are gone then I'll probably just slit my wrists with my Ritter MK5.
The WTL must be greater than that surely, You've still got your legs and as most in the western world a reasonable amount of subcutaneous fat still left. Good to go for another 3-4 months I reckon, heck a lot of the folks in the southern states are good to go for year.

It might be prudent to pack some decent walking shoes or boots as well. It could well give you another 1000 miles action radius before resorting to the Ritter MK5.