you guys are making it too complicated. a ROUGH general rule - 1/3 energy of the gasoline goes to work, 1/3 goes to radiator, and 1/3 goes out the exhaust as heat.
The exhaust side of turbochargers work primarily becuase of HEAT, not pressure. The ENERGY in the exhaust is primarily found in the HEAT.
If you think about it, if it takes 15 horsepower to cruise down teh road, then there is 15 horsepower going out the tail pipe, and 15 horsepower in the radiator.
If we could figure out a way to make a Rankine cycle even 20 percent efficient we could almost double our mileage!
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