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I'm 99% sure you can't. If you have a GM card, they are offering an additional $2K top-off, at least for many cardholders. Total 4K off for me. It's tempting.
I'll have to keep this in mind. I do have a GM Flex not sure how much $$ its good for though.
I'm leaving well enough alone. Had mine almost a year now. Bought it used, 2.6. All leather,loaded, runs good no problems. Maybe in a couple years but I like what I have