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[Phys-L] various vehicle efficiencies and unintended consequence(s)

Corn is very poorly efficient, besides using much needed water, polluting, and displacing food.

The numbers:

at the vehicle:

electric 60%, ice 30%

solar conversion:

corn 1%!, solar panel 20%

Carnot engines (nat. gas, coal) ~ 30%. W/combined cycle . ~ 60% <> <>