> Fuel celled vehicles will almost certainly do the same thing, if for no
other
> reason than hydrogen is low energy-density fuel compared to any petroleum
> distillate and efficiency will be necessary to provide a sufficiently
usable
> range.

Gasoline is about 18,000 btu/lb and weighs 6 lb/gallon, for 108,000
btu/gallon.

Hydrogen is about 61,000 btu/lb but weighs 0.5 lb/gallon, for 30,500
btu/gallon.

So you need 3 times the volume of H2 as you do gasoline, but that 3x volume
is 1/4 the weight.

Hydrogen also need to be kept at 423F below zero and no matter how much you
insulate, you will have a small boil-off due to heat leakage, so forget
about storing the vehicle in a sealed garage - you will have a slow buildup
of explosive H2 gas.

You'll probably see some kind of generation-on-the-fly from another fluid.
This also avoids having to cryo-cool the gas to liquify which itself is very
energy intensive (massive refrigeration).

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