You can create synthetic fuel from the air, not very effective but it works. You can grow corn (or any high sugar crop) and convert it to ethanol using ferment

You can create synthetic fuel from the air, not very effective but it works. You can grow corn (or any high sugar crop) and convert it to ethanol using fermentation and distillation. Making fuel isn't really that difficult. Making it cheaper than the oil industry can refine it from crude, that is nearly impossible.