Here's another whistle story. I noticed the other day, a sort of whistle or whining sound that lasts for about 2-3 seconds when I lift off the pedal. It is not super loud, in fact the only reason I heard it is because I forgot the faceplate for my stereo that day. It may have been there many times before, just not able to drown out Stevie Ray, lol.
Anyway, I have since determined it to be loosely associated with cold weather, say under about 40* F. I say loosely, because though it doesn't seem to do it every time, even in cold, but it has not done it on warmer days (so far).
I haven't noticed any performance or fuel economy issues. Just curious, and keeping my ears open to it worsening.