4) Most annoying: car starts vibrating around 70mph, then gets variably better or worse as I increase speed; the severity of the vibration and whether it gets better or stronger with speed varies randomly. Balancing (by two different shops), alignment, and tire rotation didn't help. There's also some balding on the outside of the left front tire.

Newbie here. Like to say hello to every one.

I am having this same problem. If any one has a clue as to what is going on here please let me know. The car does not pull, drives straight, seems to float a fair bit though.