Does that happen within 7 months? I'm writing the intro at this moment and kept the apocalypse at 7 months prior. So probably they will find out about fuel soon. Keep in mind though that they are at an airport and they should have kerosine at rather large amounts. Not sure if that has the same degrading levels as normal fuel. Also not sure if there is any oil refineries in or near the Arizona desert where the group can just pull a switch and get fuel. Maybe they can barter some fuel from a refinery kept by another (rival) group? We have pretty girls to barter  O:)<br/><br/>I was thinking that they somehow find some way to make cars or machines run on other things than fuel eventually.