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I do like your enthusiasm about how to make extra energy work to propel our vehicles.
Do not give up too easily on just how to extract extra energy out of the fuel we use to move our cars.
Since the engine does create extra heat in areas that need to be cooled, such as the exhaust system, there is free lunch here concerning excess energy can can be harnessed in some way.
Using a turbine in this area to generate electricity would indeed provide a net gain in energy efficiency.
Just don't try to harness this energy from the cooler, moving air. The goal to high efficiency here, is to present the air with the least amount of drag as possible, and this includes turning fan blades.
Jim.
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