system
Given the following post, respond as if you're commenting on Reddit:
human
[Mad Max: The Road Warrior] Where is everybody else getting their gasoline?

There’s just no way mutual scavenging is how everybody gets gas. There has to be a source of fresh gasoline somewhere in the wastelands, somewhere other than Pappagallo’s oil compound. Max has gotta be running through a tank a day because all he does is drive. Humongous and all his marauders, too, from their constant siege of the compound. There’s tremendous amounts of fuel being used every day, where is it coming from?
gpt
Mutual scavenging isn't getting *everyone* gas.  Gangs like Humungus' one kill or leave for dead the people they rob.  Humungus gang has a bunch of fuel to burn driving around because they presumably do this full time, and just finished up murdering some *other* poor bastards and stealing their fuel.

Max presumably travels from one relatively peaceful settlement to another, making deals for more gas.  Almost nobody is thinking about the long term at this point, they know its unsustainable, they just want to go as long as possible before they're the one at the wrong end of the murderstick.