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I realise this has been debunk many times, but:
Car manufacturers have taken all sorts of loads off the engine and replaced them with electrical loads, power steering, A/C compressors, electric water pumps etc.
An electric supercharger that delivered sufficient CFM and only worked to boost acceleration (rather than all the time like a traditional supercharger) could give a downsized engine power when needed without the need for a complex turbo retro fit or the MPG hit of a constantly spinning supercharger.
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