I have the strength and courage to get through any situation.

Nobody stockpiles this in advance. It gets issued at the point of use, which is why people so often report afterwards having no idea how they did it — there was no reserve visible beforehand and none left over at the end.

So whether you have enough for what's coming is a question you can't check. The gauge doesn't read until the engine is under load. Everyone who has ever come through something was, the week before, entirely unconvinced they could.