Both GM and Ford and probably others are looking to wrap the exhaust in thermoelectric (TE) material in the hope of increasing vehicle efficiency by a few percent, perhaps 5% or so – this becomes particularly relevant for hybrids. One must presume that the cost of such a system would not be too high relative to the cost of the vehicle. Of course adaptation of such a technology may not be suitable or possible, but is it not certain that cost will be a barrier. As I said before, if there is an over abundance of net energy then no worries, but it does no harm to consider backup plans. Also, in 4-5 years time when hopefully a Focus Fusion prototype is well under-way it is not inconceivable that may be fairly common place in the automotive industry – I’ll dust dust off my crystal plasma ball and see what the future holds……… yes I can see it now – lots and lots of plasma!