I don't think it is especially cheap, compared to the minimal additional cost of sprockets and chains.
Maybe I'm missing something, but it seems like not being able to move the vehicle on electric only is a large penalty. It would let you keep your engine off longer, where you don't have to pay the "keep the engine rotating" tax.
But fair enough, plan B is a short trip from some semblance of plan A.
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WINDMILLS DO NOT WORK THAT WAY!!!
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