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You should get the alignment checked at a quality alignment shop at your earliest convenient opportunity. Unless something has changed, which I doubt, the factory alignments are quick and crude at best. Some are fine, and others are not.
Many dealers don't even know how to adjust rear castor and don't have the tool to do so.
The advantage of getting it checked immediately, is that the tires are new right now. A misaligned car will wear the tires unevenly; sometimes much quicker than you would think.
...and if they do the full four wheel alignment including the rear castor, be prepared for a possible sticker shock when you get the bill. Not all dealers will charge the standard alignment price for it...my closest dealer sure didn't.
I waited for 400 miles so any settling would occur in Sway Bar, A Frame and Spring Bushing. Then had the dealer align the camber and toe to specs I defined. For the Grand Sport the allowable camber is very wide. In the rear from -0.5 to -1.7! My rear was ~-1.6 degrees, fine for Tracking but not best tire wear. I specified about -0.8 for the rear and somewhat less for the front as a compromise between handling performance and tire wear.
Only one toe was slightly out and in Red so the C7 Tech could have fixed it and said, within spec! The printout sheet would show all Green! I had handed the service scheduler a sheet of paper with the spec, centerline and range and what I wanted. Was pleased to see he gave that to the tech who let me watch the Hunter alignment machine display screen as he made the camber and toe adjustments. It took about 30 minutes as when making a toe adjustment the camber changes etc.
Told him their would be a nice tip, which I gave him. All on GM's dime.