 A large turbocharger that produces by itself, with an efficiency adiabatic of around 70%, would produce air only .In addition, the cost of energy to drive a supercharger is higher than that of a turbocharger; if it is ignored, the load of execution compression is eliminated, leaving only light parasitic losses of rotating the working parts of the supercharger.The supercharger can be disconnected even more electrically (using an electromagnetic clutch such as those used in VW 1.4TSI or Toyota 4A-GZE , although this is not because it is a double-load motor, but is intended to bypass the supercharger in low load conditions) which eliminates this small parasitic loss.