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> gasoline which is close to 90% efficient IIRC.

Common gasoline engines have an efficiency around 30-40%, assuming modern high-efficiency designs. For older designs this is closer to 20%.



I'm talking about the production of gasoline there (vs production of food).


Ah, my mistake. Your number matches gasoline refinement (I see 85% quoted), but that's only one part of the gasoline supply chain.




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