*Agree* with TSquare. The bottom spoiler in the front is rubber and designed to "break away" and still remain intact. Test it yourself and you'll see that it won't break off. The older cars would get damaged from bottoming out. With the Volt; they figured that out. It's all part of the aerodynamics.
Have no fear!
Disagree, at least partially. Ours has also separated at the joint, and scrapes CONSTANTLY, no matter how carefully driven. In my opinion it is a design flaw which I am afraid WILL break and they will want to charge me for repair, or charge me at lease return.
I read elsewhere GM will swap out free for a shorter one, but haven't tried that yet.
I'm not concerned about the aerodynamics and range reduction, since 90% of the driving is city speeds.