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Such a machine would use more energy creating the stuff than could be obtained from actually using it.
Natural crude oil took a lot of energy to create, in the form of heat from the Earth, as well as pressure. That heat from the Earth didn't cost us anything as it was happening anyway, so from our point of view there's an energy gain, even after the energy cost of refining it. However, if we had to also provide the energy to create the crude, as well as refine it, there'd be a net energy loss to us.