There is a TSB for poor alignment which causes this symptom. My car is suffering and has worn the rear tyres to replacement levels in 19K. Much more wear and they will be illegal. Still working with Austral to get them to acknowledge that my VIN is within the effected range, my symptoms match the problem exactly and my tyres are trashed. 
So far all they are telling me is that I can't ever expect more than 20K out of a set of 4 tyres with this vehicle and that my alignment problems are self inflicted due to poor road surfaces. The tyres are worm because I didn't correct teh alignment problem sooner. It has been Austral serviced since new, but apparently they are not responsible for telling me that I needed an alignment at the previous services. 
 
Steve
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