About 60% of the fuels energy,at any given load, is lost to waste heat.About half of that heat goes out the tailpipe,the other half into the cooling system.As to how much can go back into the inlet tract,I don't have a clue.Charge density would suffer at some point,with power falling off.The PNGV cars were moving the heat exchangers to the rear quarter-panels,ala Ford Probe concepts.As to the "pointy" nose,the body of research suggests we can do as good with less radical architecture.
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