I agree, mort. it would seem to me that a higher voltage starter/alternator with regen/mild hybrid capabilities is a no brainer.
Most of the added cost would be in the battery and even that wouldn't be much if you didn't get carried away with battery capacity.
A more robust higher voltage alternator would cost a little more, but, eliminating the starter would recoup a good part of that.
Other savings in weight and material costs would result from smaller gauge wire used with higher voltage systems.
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