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Point Missed
I think a major point of this thing is that the engine needs to be cooled. Liquid cooled engines can be built to tighter tolerances than air cooled and can thus be made more efficient. It makes more sense to scavage "wasted heat" from a system already in place.
Also in my experience a cold winter day in a liquid heated car has been much more temperate than the same day in one of my old corvairs or my dad's piper with "air" heat/cooling. I believe it has something to do with the liquid being able to carry more heat, thus being the more efficient medium for heat exchange.
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