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The most primitive and efficient way to use coal is for heating. You can approach 85%-100% efficiency there. Uranium can never be used in such a basic way....cannot be used in a simple furnace or cook stove. Nuclear yields energy for man only via electricity generation.

With the starting point that "nuclear yields energy for man only via electricity generation" I would guess that nuke generated electricity will be 75% utilized by the time it's hydrogen finally powers an automobile. 25% will be lost from transmission lines, from generating the hydrogen, from filling fuel cells, then finally generating power in the automobile from the fuel cell.