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No way that you get an automotive fuel cell anywhere close to 70% efficiency. Try 50% if you are lucky.

Plus you have the energetic cost of compressing the hydrogen to 10,000 pounds/square inch, which ain't cheap.

Fuel cells are at a big disadvantage to battery electric cars when it comes to efficient use of grid electricity.

The grid electricity conversion efficiency, is just over 70% and similar turning the H2 back into electricity.
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