I saw that discussion too.
In my opinion, that's overkill. If you fill up everytime you go into one of the larger towns, you won't run out of gas. Worst case, you'd have to spend a few dollars extra on gas at Fontana to get you to Robbinsville. I'd rather pay a little extra than have the risks associated with carrying around a smelly gas can.
There is a gas station at Deals Gap, but as a courtesy, most car clubs don't fill up there. They leave that for the bikers. If you do have to get gas there, I believe they have an 8 gallon limit.