Idle stop is pretty much ubiquitous nowadays. Renault's is said to be good for 400,000 cycles. That's once a mile for... well you know.
Mazda's is the best system, but in practice, I've tried to beat Renault's system and can't. My Fiat's is much more of a 'first gen' system, no where near as polished, but gets the job done usually.
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