justicecenter,
Not every 04-06 Aerio will experience the tire wear issue, only the ones at the ouside limit of the original rear toe spec (and even then, it's not every car). If there is an issue, it will usually show up by 10-12,000km's as excessive wear on the outside edge of one, or both of the rear tires.
Adjusting the rear toe to the new spec (2.6mm +/- 2mm) will fix the issue for sure. I'd recommend setting it as close the the minimum spec (0.6mm toe in) as possible.
Tim
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