I was getting a 66% return on random electrical wire after burning too. Yep, you need to cool it down right after burning or it oxidises & ruins the return.
Last week I ended up selling 88Kg of plastic coated wire for NZ$174. I could have got just over $300-$330 for it if I burnt it.
But it's not so environmentally friendly these days & my good secluded spots not available to use any more..
I did that pyroalisis thing once, small scale. The solvent it made was far far more flammable than petrol.
Hydrogen sulphide fumes stopped me finishing the experiment.
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