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Many things have been talked about with heat recovery, no decent results yet though.
Options considered are:
1 / TEG's, Seebeck effect, the reverse to Peltier and the two types of cells are not interchangable, Seebeck creates a current through a temperature differential, while Peltiers create a temp differential when a current is supplied, either way low efficiency.
2 / Sterling engines, as mentioned, but very bulky for power supplied.
3 / Steam generation for steam turbine/engine, again heavy and bulky
4 / Heat ejection in rear to energise air in rear void, idea is if you increase temp, you increase pressure and reduce drag, this is my favorite at the moment, but how to get the heat out there?
The F1 thing is great but they're already anticipating teething issues with Billions spent, so unlikely ecomodders can do it with $50.
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