Tesla Robotaxi currently covers about 400 square miles of the 3.5 million-square-mile United States, according to investor Ross Gerber, who said the network should expand but warned the rollout could take too long for current observers. Tesla is scheduled to hold a Cybercab launch event in Austin, Texas, on Thursday this week. The two-passenger vehicle has no steering wheel or pedals and has been presented as a platform for future vehicles. Investor Gary Black of The Future Fund LLC remains skeptical about Tesla's autonomous-vehicle ambitions, saying Tesla and its competitors will achieve unsupervised autonomy. Separately, Swedish autonomous truck operator Einride AB ordered 500 Tesla Semi Trucks, with CEO Roozbeh Charli confirming that 75 will be delivered before the end of the year. Tesla shares fell 0.92% to $364.57 in Tuesday premarket trading.