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I've never heard of 78 volt systems, but there was talk about a 42V system (essentially, 36V nominal, 42V charging). I think it ended up being a cumulative cost problem (i.e. EVERYTHING would need to be retooled, from dashboard lightbulbs to starter motors.)
Too bad, too; 36-42V would allow for a powerful enough starter that auto-stop would pretty much be a standard feature, and even some very mild hybrid regen/boost would be feasible.
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