So in essence, if you're stuck for a day you're going to be screwed regardless, except for some edge cases like a large full tank and an ICE that doesn't consum

So in essence, if you're stuck for a day you're going to be screwed regardless, except for some edge cases like a large full tank and an ICE that doesn't consume a lot of fuel when idle, or a heat pump driven EV with a full charge in a decently sized pack. There will always be older or less efficient cars, smaller gas tanks, smaller battery packs, resistive heaters, and people not rationing the energy available to them.