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As someone who just spent a weekend doing some wildland fire mitigation using a six inch chipper, I'd say that's probably the best wood gas fuel source. Easy to shovel into a small opening, fuel dense, and easily available on the cheap. My neighbor uses a burn barrel to get rid of yard scraps and says wood chips just will not burn, but whole branches burn just fine. Given that what you want is anaerobic off gassing, that seems like the perfect wood gas fuel. As for the fuel to heat the chips, probably split would would work better since wood chips don't burn well because they can't get enough oxygen to them due to the density of the fuel.
Now that's a zero waste solution.
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