Actually you'd use hydrogen peroxide
Adam said:
"Space relevance? Hmmm... well biodiesel is an option for a Mars base with a good greenhouse, especially if gengineered plants are growing out in the Martian soil. "
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The best chemical fuel for use by a Mars colony is hydrogen peroxide. The hydrogen peroxide would be run over a catalyst as a mono-propellant to produce oxygen and steam. Hydrocarbons from a martian green house would be better used for lubricants, plastics and solvents.
Gary