FastPlastic - I'm not defending any claims, but there is a slight discrepancy in what you say against this...
Magnets contain potential energy. When brought into range with something which reacts to magnetic energy, that potential energy is transferred to Kinetic energy. If the potential was 2kW, and it takes 1kW to bring the magnet in reactive range, the output could be more than the fuel input used, barring losses.
Once again, I'm not defending anything, nor am I being argumentative, just pointing out that you're not taking the magnet's own potential into account with your reply.
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