Coal. Read up on coal to liquid fuels processing. Possible, not exactly cheap, but it works.
The Germans did this in WW2. The problem with their method was that it was extremely labor intensive loading low temperature retorts ("ovens") with coal to be be heated to release the liquid components as gases, which were then condensed, and then cleaning the remaining portions of the coal (coke) out of the retorts afterwards. Since this was a pure low skill labor job, they decided to use criminals being kept in "concentration camps" to do most of it. A famous one of these Coal Gasification Plants was called Auschwitz.
Ahh,happier times.
NOT CHEAP! The joo masters won't allow it.
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