6. Make your own biodiesel
What would the post-apocalypse be without badass armored vehicles? Let the bikers and scavengers fight over the dwindling stock of gasoline and brew your own biodiesel. For as little as a few hundred bucks you can be set up with a home-brew biodiesel kit. Spend a few hours on a Sunday every month and forget about filling up at the local gas station. And when the ants rise up and take over all forms of government, you'll be able to stay ahead of our new teeming mass of overlords in your pimped-out, biodiesel-powered 4Runner.