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You free up mechanical drag on the engine, but you gain back whatever it takes to drive the electric accessories in inductive drag in the alternator.
No such thing as something for nothing, but depending on what components you switch out, the newer electric components could be more efficient than the mechanical ones, so you might see some.
On a race engine where you've geared down the alternator the car usually doesn't make enough charge at idle speed to keep the battery charged, you have to be running the engine at the higher RPM's where racing happens, in that case you would have less inductive / mech load on the engine, but for a street car with a stereo and lights and air conditioning that approach is impractical.
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