I bet what Goatrider said is correct about the gas burning off. I can't imagine a gallon and a half of gas not getting a fire going!
I find that no matter how often I am out or how much older I get, I still learn something new every time. It may be something simple or it could be something major. Often you find a piece of equipment is inadequate or fails, sometimes you realize all of a sudden that you need to have something with you that you left behind or need to purchase. Maybe that is why I have so much gear, I like to try things out, that way I learn myself what works and what doesn't. CHeers!