== Turbocharger == 

 Any turbocharged engine is effecively a combined cycle with the turbo charger extracting extra energy from the exhaust gases, and which could be used to drive the wheels, however it is more convenient to use this extracted energy to force air into the engine which reduces the suction loss and thereby improves the efficiency overall. 

 It seems to me this is not correct at all. Turbocharged engine is not effectively a combined cycle. any engineers around to correct this?