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As far as I can tell, combustion of methane seems to produce significantly more energy (around twice as much) as burning hydrogen, for the same amount of oxygen

As far as I can tell, combustion of methane seems to produce significantly more energy (around twice as much) as burning hydrogen, for the same amount of oxygen. Note that burning carbohydrates also produces carbon dioxide in addition to water.

Roboprog 10y ago
Sorry, No. It takes 3(O2) molecules to combust a CH4 molecule. 3(O2) + 6(H2) generates more heat.
- FreeFull 10y ago
  Sorry, yes, you're right. Then splitting the water would definitely be energy negative (although still desired, to produce something the colonists can breathe).