[Stubby79]

Crashy, part of your first and second post on this page contradict each other. If the alt was putting out full power all the time, as your second post suggests, then a smaller alt would put less load on the engine every time, which would use less gas, and therefore be more efficient over all, from the perspective of fuel burned.

They don't work that way anyway(at least not any more); both your posts suggest that alternators are working all-out, all the time. And, besides, alternator efficiency is only one part of the equation of over-all fuel efficiency.