We contacted automakers for their take on this hot-button issue (no pun intended) and got some surprising responses.

The EPA said it will end credits for the start/stop feature, which shuts off gas engines when cars are idle to save fuel.

As part of its broader rollback of U.S. fuel economy rules, the Trump administration says it is eliminating a credit for automakers that got breaks on the fuel economy compliance if they installed ...

For more than a decade, automatic engine start/stop systems were sold as painless climate tech, a clever way to trim fuel use by cutting the engine at every red light. Now the feature is rapidly ...