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My July/10 2011 doesnt have it.
As long as the default is off all I can see is you are getting a bigger starter (and maybe battery) out of the deal. Its possible the start up programming may be different as well, if mine sits a minute or two when warm and I restart it the idle seems different (air pump maybe) and then it smooths out after 10 seconds or so. I would assume if you had the auto stop/start that doesnt happen.
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