BMW includes the start stop system in its latest 3-Series and M3 models, but drivers have the choice of turning the system off when the car is started via a dash-mounted switch. On new 3-Series cars, ...

The automatic start/stop function shuts off the engine when your car is idling. But just how much does this technology really save you on gas?

Start/stop technology can mitigate this waste. Some three dozen car and truck models already available in the U.S. have start/stop systems of one sort or another. By 2015, this is expected to extend ...