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Most cars and even some motorcycles in my country are flexfuel nowadays, so it would be a no-brainer to homebrew ethanol if I lived in a place suitable to grow some crops with a high carbohydrate content. I also lurked about biogas, but it would be easier for stationary applications.
As far as pyrolisis goes, I guess you know about those gasifiers, fed either with coal or wood, which were fairly popular during WWII.
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