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The fuel is refined from hydrocarbon liquids and gases derived from wells drilled deep into the Earth's crust. Those hydrocarbons were/are derived from far deeper sources in the mantle. My theory is that at certain as yet undiscovered levels of the mantle, the temperature and pressure are ideal for elemental carbon and hydrogen to combine. Over time, these hydrocarbons seep up into the crust where we find them. The ones from the deep oceans are the purest because they have not yet been exposed to the organic contamination found either in shallower seas or on terra firma.

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