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The weight of the protective structure for 10,000PSI hydrogen tanks, and the battery it carries, and the cooling system, and the fuel cell itself. Compare the weights of say the Toyota Mirai vs the Chevy Bolt EV: 4,078 pounds vs 3,563. The Mirai has (in theory) more range, but it carries 1 less person.
A kilogram of hydrogen is almost exactly the same energy content as a gallon of gasoline.
The 60kWh Bolt battery holds the equivalent of 1.78 gallons of gasoline. (33.7kWh / gallon), and the Mirai can carry 5kg of hydrogen.
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