https://www.reuters.com/article/us-tesla-batteryday/as-tesla-battery-day-opens-elon-musk-touts-new-version-of-autopilot-software-idUSKCN26D19P >Tesla Inc CEO Elon Musk promised a new version of the company's Autopilot system at the company's "Battery Day" on Tuesday, even as he tempered expectations that Tesla's electric vehicles will soon surpass the cost and convenience of traditional gasoline-powered cars.