So...if they had run out of gas, what would they use? If they had a jerry can, surely they'd put gas in the tank. I guess they could have kept a can of gas just for that purpose. Which is strange. Maybe they had a can of diesel left from their own truck.
I would assume they needed an accelerant to get the kind of burns shown.
I agree entirely. I assume they used whatever was handy as an accelerant, which was probably gasoline. I just wanted to make the (probably needless) point that if you want to torch something safely, diesel fuel is a better option.