all right, since sharkbait can't get it, an easy guide from mortosthegodly
1. walk for the first few levels
2. ignore cities and save your money for a flamethrower and fuel
3. everytime you flamethrower, you get full health, full AP, and 10 jute bags for free! so keep buying fuel and nothing else
4. hitchhike once you have some money (past like, the third or fourth level)
5. conserve flaethrowers until your dying
6. after denver, in hitchiking the cars come so fast that you can just press space as soon as the minigame starts and you'll get one :)
enjoy, mortosthegodly!