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I checked the brochure for the 2008 model and all Tourings and GT come standard with the 6 CD changer. If CarAndDriver is correct, then Mazda must have made some changes to the packaging prior to the 2008 model.
I knew for sure 2004 and 2005 did not come with it standard. I wasn't sure about later years. I have a feeling 2006 did not as well, but after that I didn't want to make a false claim.
I am not surprised Mazda made it standard. It's table stakes in 30K+ cars.