if you think its a good idea to shut your engine off to save gas then you should not have purchased a vehicle that gets lousy gas mileage to begin with! just my opinion.
i hit that off everytime i start my jeep. its annoying does not do anything good at all. you burn more gas when your vehicle first starts. its hard on your starter, battery, and every time it shuts down all your oil runs down, so basically your adding wear to all those parts.
automatic does it too! if you take off fast and let off gas it hangs up in gear and wont shift right away. dealer says its emission system doing its job.