• When you stop at traffic lights or your vehicle is idling in a queue, this technology can automatically switch off the engine (while still supplying power to essentials like the headlights, air-conditioning, radio and the Ford SYNC system). When you're ready to move, just depress the clutch and select first gear as usual, or release the brake on an automatic, and the system restarts. Auto Start-Stop is particularly effective in town and city streets, where it can really help cut fuel consumption.