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Depends on how much civilization one gets on Mars verses the needs of the Homeworld (or "oppressive colonial overlords", depending on the politics at the time). If the fuel is still desired on Earth, than it would need to be shipped home. But first it would need to get to Mars orbit. Then across interplanetary space to Earth orbit. Then shipped down to the surface where normal distribution methods take over.
While Space Elevators migt be viable for this, you would need at least one on Mars as well as one on Earth. Then you would need a vessel that can profitably move the oil, metals, water, or whatever (food), from one planet to the other. Then you might need to provide an security force to protect that vessel if someone decides to take it themselves for a different Space Elevator (assuming there is more than one).
Though if there is only one port, piracy would be kind of difficult, if the goal was to get the goods back to Earth. Now if the goal is to get them someplace else, or to bid off the stolen good for later pickup (once money is delivered), than their might be a profit in it.
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