Quick question : when the stop -start stops the engine, almost invariably it will start up again within about 30-40 seconds.  The dealer I bought it from assures me this is normal, but it seems a bit weird to me.  Why not keep the engine stopped until I need it again?  I know that there are LOADS of variables as to when it works, but it seems odd that it starts up again all the time.     SO, how long does your stop-start keep the engine stopped for please?  Will it stay stopped for mor