What makes you sure that we ran out of petrol, coal and "all of our other shizz"? Vehicles could run on Hydrogen. There's no mention of any water shortage in the game. Or perhaps they run on our old garbage, like Doc Brown's Delorian (sp?) at the end of "Back to the Future". Maybe they use gravity...still a lot we don't understand about the potential uses of gravity. What about magnetic fields? Perhaps urine is the fuel of the future. Is it possible that they use alcohol? Who knows? Why am I bothering with this post? Oh ya...getting bored again.