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He just called me back. And I finally got some answers since no one else there seemed to know anything.
They said GM doesn't know how to fix the RPM noise behind the glovebox. They also don't know why the XM cuts out with the sunroof open, but they have some ideas of things to check.
They said GM also has no idea why i have this vibration in an A6. So they are throwing parts at the problem until they find what it is. (We are waiting on parts now which are on back order.)
He said they have had issues with FM radio when turning on the defroster it will cut out the FM. But he said mine worked correctly, but another new one on the lot did cut out.
He gave a plausible explanation about the mileage and FE.
I'm still not sure why the paint was never fixed, but he said it will be next time it's brought in.
It was good to finally get some answers, even though some of there were "don't know."
Hopefully we'll get this all sorted out soon and I can drive off into the sunset and live happily ever after.
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