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My '13 1SS/RS had 7 when I did the test drive...but I do not have any stripes. I worked for GM in college and I spent some time at various final assembly plants....the last step of assembly is where they put the car on a rolling dyno...hook it up to a computer and do a series of planned tests....acceleration, braking, lights, etc....if the car fails it goes to tech inspection and they may or may not drive the car after correcting any issues.
So it is possible your car could have had a minor issue during assembly which was fixed after it came off the line...which could account for a few miles.
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