I have owned both an AP1 and AP2 cars. Having driven my AP2 car for about a month, I am starting to suspect whether the ultrasonic sensors are really longer range than AP1. Several of my unscientific observations indicate that the range is similar to that of AP1. Unless, they need to update software to make it longer range. Which brings me to another question, whether they are actually different hardware (irrespective of what Tesla claims), and are they getting a longer range by a FW update since it might be an algorithm change that could enable longer range?