are you sure about us not being sure?
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cause the market calling it 'Hydrogen Fuel' kind of makes me think different
Yeah but "fuel oil" isn't what your car runs on!

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I think of it like crude oil and supertankers, the hydrogen fuel is the raw stuff, it's then either used for industrial processes or refined for starship use.
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Along the way it incurs tax, so the cost of ship fuel is much greater than Hydrogen fuel. If, as someone mentioned, the taxes are actually based on ship tonnage or FSD emissions or some other metric, that would account for the discrepancy.
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Maybe (OT here) the community should put together a list of "in fiction" explanation for some of the oddities of the ED universe (vanishing bounty vouchers, nerfed yaw, rectangular docking slots) to a) help newbies b)for fun.
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It could take the form:
Q: Why are docking slots rectangular and why only one?
Answer (sensible): Tradition, the first Elite game had a rectangular docking slot
Answer (fiction): Blah blah blah