The noise I was getting was not necessarly speed dependent, but more dependent upon the types of bumps in the road and temperature changes. What helped me identify the problem was when I was sitting the car waiting for my wife after just driving out from a 60 degree garage to 30 degrees outside, I could hear the creaking sound about every 5-10 seconds (car was turned off). That told me that is was something that was shrinking from the thermal change, which lead me to looking outside.
Nissan had looked for the problem for me as well, but being it was intermittent, they were not able to find it.
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