I have been to some of the most remote places in North America that can be reached by road.
Coldfoot, Alaska, Dawson City, Yukon, Chicken, Alaska, Eagle, Alaska and Telegraph Creek, British Columbia.
Yes, I have also been all over the west, Big Bend, Death Valley, etc. Big Bend and Death Valley don't have anything on the remoteness of the above listed places.
All of the above, including Big Bend and Death Valley have readily accessible diesel fuel. (Dawson City, Yukon takes the cake for the highest price. I think we calculated it out in the $7 a gallon range this summer. Still, it was readily available)
This may have been an issue 60 years ago, but it is no longer.