With the Smart Air Suspension, at what speed do you set it to transition from "Standard" to "Low" height? 55, 60, 65, or higher MPH? I don't care so much about the aesthetics (lower looks nicer). I understand lower suspension makes the car more aerodynamic and efficient overall, at the potential expense of vehicle damage (if you hit a pothole or any item on the road etc). I've heard some people even suggested lower suspension causes more tire wear-n-tear. Is there any truth to that?