It's estimated that 13% of the fuel consumed nationwide is lost idling. Start stop should be required by law.
I think the technology is there with a toothed belt and a strong enough alternator-starter component. Maybe a larger battery for extended stops in traffic jams. You could also eliminate all the other belt driven accessories for more efficiency gains.
It could even be configured to provide a small amount of electric boost to the engine on acceleration.
regards
Mech
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