Yeah, I've heard that too, about it being the most aerodynamic ford sedan. It makes things a little brighter to know that
As for the window visors, in an effort to save gas I leave my windows partially down at all times when the car is parked to keep it cool and hardly ever use the A/c... so I need to have those on in case it rains... I figure the cost of more wind resistance is less than the cost of gas my A/C would suck up.
As for lowering my car, I already bottom out on some speed bumps and dirt roads... My car may seem higher than most, but I think it has quite a low ground clearance. So, it can't really be lowered much more.