Uneven Rear Tire Wear??

[rvancil]

Hey guys! New owner of a 04 4.8is...sweet ride...Just picked it up yesterday and noticed that the driver side rear tire is much more worn than the rest?? All three other tires have around 50% tread left, yet the driver rear is pretty much bald on the inside/center of the tire tread...is this normal?? Might it have some sort of control arm problem? Should I just replace the tire or bring it into the shop and have them look it over as it is still covered under the factory warranty?

Also, because I am the second owner, do I have the ability to purchase the extended warranty for the car or am I out of luck?


Thanks in advance for the help!