BasilCars.com offers a little clarity on the auto-stop feature available on some newer vehicles.
The auto-stop feature shuts the engine down during stops at traffic lights, for instance, and starts it back up once the driver releases the brake. This feature is designed to boost fuel economy. Auto stop doesn't kick in during cold winter weather, however, since the heater or defroster may be on.
According to the Basil Cars post, idling vehicles waste close to 4 billion gallons of gas in the United States in just one year. The auto-stop feature helps reduce the wasted fuel.
For 2018, the feature will be available in all Buicks, several Chevrolet and Cadillac vehicles, as well as some GMC, Ford, Toyota and Volkswagen models.
Many vehicles also offer the option to disable the auto-stop feature. It may take some time to get used to auto-stop, but in the long run, it's better for fuel economy and the environment.