Given the design of a turbo this doesn't seen feasible. It might be possible to remove the intake side of the turbo and somehow rig the shaft up to a alternator but the drag created by the alternator would probably require the engine to be running at a high rpm in order to spool up the alternator there would be much more loss than gain. That doesn't mean that a turbo by its self is a bad idea for fuel economy if set up properly. I remember reading an article a couple years ago about a guy turboing his motorcycle for improved fuel economy I believe he called it improved volumetric efficiency
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