I've heard that the gas is also used to cool the pump (in a seperate chamber?), and that if the tank runs completely dry, the pump would fail causing expensive repair.
Does it then make sense for the last few gallons to NOT be "usable"?
Of course since I have never run the H2 till it sputtered out of gas, can't tell you if those missing gallons are actually there cooling the pump or not...
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