2004 Mercedes-benz slk320 excessive wear on front tires

http://repairpal.com/car_types Go to the Repairpal estimator and under the common problems section it talks about excessive tire wear. Irregular and premature tire wear can be caused by the lower control arm bushings cracking and causing excessive movement at the control arm pivot point. Ball joints can also wear out prematurely, causing similar tire wear symptoms.

The first thing I would do is to have the front end inspected and the alignment checked on the vehicle.