it's funny you guys mention this because when i test drove a platinum silver i recall hearing it. im a musician and have good hearing. its like you turn your head one way and the pitch just hangs there in your ear. immediately wanted to EQ that out.
i mentioned it to the sales guy since he rode with me and he said he couldn't hear it. he also said he's getting old and can't hear many things. i remember joking around with him that i have perfect hearing but i can't hear my wife sometimes.
i later changed my mind on the color and went with silver... test drove my car that i currently own and i didn't hear that pitch. i guess i got lucky.