Hey Stan, I've gotten stranded twice in spots with zero cell service, on paved roads. One time I hit a deer and the truck dumped most of its fluids, the other, lost an alternator, not a good feeling. One of the times, no one drove by for nearly three hours, luckily things were getting figured out by them.
I never pushed the fuel limit, just start getting the mindset that there are some places with few options. My boy and I got stuck in a white out on a mountain pass. A four hour chip shot turned into over seven hours, and six of those hours, not a hint of a gas stop. The temperature dropped from the mid fifties to the low single digits, and no bars on the phone for way over half the time. It was a duck hunting trip. I told my boy we just got shut down, but he insisted we go out the next morning. The knee deep flats, we waded two days earlier, were solid walkable ice. I told my son not to test it out, but I was half hoping he would break through, because of how great he used to listen sometimes.