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SuperGen, a new electro-mechanical supercharger technology jointly developed by automotive engineering specialist Integral Powertrain and transmission technology company NexxtDrive, is designed to improve on existing turbo diesel theory. The variable-speed, electrically-controlled supercharger design uses an advanced gearing system that can accurately vary the speed of the turbo compressor from zero up to 150 times crank speed.

To convince naysayers and an increasingly skeptical public about hybrids, automakers from Subaru Motors, Suzuki Motor Corp., to the hybrid "powerhouse" Toyota, are scrambling to develop a low-cost version of the technology.