I found myself fourth in a line of cars heading up a curving hill with a temporary passing lane. The first car had been steadily driving below the speed limit for a while. The second car, a Mustang, had been holding back a couple of car lengths and letting the lead car set the pace. A Toyota SUV was third in line and chomping at the bit, flashing brake lights frequently as it rode close to the Mustang's bumper. Once in the passing zone the slow lead car stayed in the left lane (!), the second and third cars moved to the right but in a surprising move the Mustang did not run ahead (?). Model X swiftly accelerated passed the frustrated Toyota and the uninspired Mustang, then deftly deployed regen to hover like a hummingbird behind the lead car while making sure the way was clear in front of the Mustang before darting around to lead the pack just in time for the end of the passing lane. I never expected a car this heavy could be so nimble. What fun!