Ok, I'll pay you that,
I hadn't gone back to look at the actual numbers.
But I still think the complexities & return are still going to take it down the path of diminishing returns.
Unless the salvaged heat is somehow converted to useable energy, then the overwhelming issue is to still remove the heat generated during normal operation as it is currently a waste product for ICE's, this will still mean radiator & cooling system cannot be downsized to any great degree.
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