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The weight savings is very real, but minor. The load on the electrical system would actually be higher until fully charged, and then it would be about the same as a battery.
What you could potentially do, however, is build a controller so that while pulse and gliding, is have the alternator only deliver current while engine braking, using the capacitors to power the vehicle while accelerating.
How you'd implement such a thing I'm not sure, but I am sure that the gains would be measurable, if disabling load on the alt does, in fact, have an impact on economy.
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