Tesla's biggest threat is now GM (TSLA, GM)

Troy Wolverton GM has demonstrated an all-electric self-driving fleet of cars in San Francisco. Tesla continues to struggle to scale up production of its Model 3. In just a few years, the Detroit giant has surged ahead of the Silicon Valley upstart. Earlier this week, General Motors and its Cruise self-driving-car division staged their first demonstration for the media of all-electric Chevy Bolt vehicles that can handle the streets of San Francisco without anybody's hands on the wheel or feet on...