Being new to the Volt and the forum I haven't had a chance to read many of the posts yet so I hope I'm not being redundant posting this question. I noticed when driving the Volt with my driver's side window down I get an annoying pulsating wind gusting at me. I actually have to roll up the window and drive with the window up. Is this common with the Volt? Is it some kind of design for aerodynamics or something?