Just to clarify, the problem isn't the tires themselves. It's an alignment issue. The Monaro was designed to run 18" wheels with 235mm tires. GM put 17" wheels with 245s on the majority of '04-'06 GTOs. So unless the camber is adjusted to the maximum positive end of the specs the front tires
may rub on the struts. GM's warranty covers alignment issues up to 7500 miles. I noticed a minor case of rubbing on my passenger side at 10K...no signs of tire wear, just some paint rubbed off the strut.
I had only 1/8" clearance on the passenger side and 1/4" on the drivers side. I took it to my dealership and they aligned it under warranty even though I was past 7500 miles. Afterward I had just over 1/2" clearance on both sides. As soon as I got the car home I pulled the passenger side wheel off and repainted the scuffed strut so I could tell if it happened again. I'm now just past 19K...no scuffs, no abnormal tire wear, and I still have 1/2" clearance on both sides.