On a recent trip into London and Stop/Start worked very well (used with Auto Hold as well). The one thing I did notice is that the Stop/Start system doesn't like quick on and then off times i.e. in London I pulled up quickly in a queue, Stop Start kicked in, when the queue moved a few feet, I came off the brake, engine fired up, 5 seconds later, stopped the car again. Stop/Start function would not activate.
I suspect there must be a minimum engine on timer in the logic to stop starter motor/ battery burn out.
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