The industry part of Advanced Autonomous Industries. Adds motors, powered offshore pumps, burner labs, and more. Alters tech and recipes. Additional features will be added gradually. Other AAI mods are not required.
According to FNEI, there appear to be two carbon-based recipes for vehicle fuel: one consumes 3 carbon (18 MJ) and produces 2 fuel (20 MJ), the other consumes 7 carbon (42 MJ) and produces 3 fuel (30 MJ).
I should think that the latter one is incorrect. Unfortunately, it is also the one that takes priority.