I understood your meaning. I don't think any of your scenarios are "impossible" but I also don't think they are likely. For the reasons I stated before, I think JH pulled into the gas station intending to get only as much gas as he could in a short amount of time, and asked the attendant for maybe $5 worth. He would want to limit the amount of time the car was visible to the security cameras and people at the station. He gets his $5 worth, a bit over a gallon, heads to another station a couple blocks away (the T/A), gets another gallon or so, and now he has enough to drive up to Larch Mountain and back to the Walmart.