 Tesla nears its earnings day with the stock firmly in the black for the year, but facing concerns about its robo-taxi aspirations, EV demand, and chief executive Elon Musk's deeper wading into politics and divisiveness. The EV maker earlier this month reported second quarter deliveries that were well above Wall Street's expectations, fueling a rally for the shares that screeched to a halt on a report that Tesla's robo-taxi event had been postponed from August to October.