Tesla Chief Executive Elon Musk on Tuesday said that the next generation small car the company is working on would operate mostly in autonomous mode, similar to a promise he made in 2020. On Tuesday he said there was a clear path to delivering a car that cost half as much to build as Tesla’s Model 3 sedan, but he offered no details about timing or models. At the 2020 event, Musk said he was “confident” that Tesla Inc would make a small, compelling $25,000 electric car that was fully autonomous, within about three years.