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Sounds like if you take too many more runs you'll have a wheel falling off. What is that noise? Check your lug nuts.
What's the distance you're running each time? I know you're on cruise control, so maybe you're going about the same speed, but what about all the other traffic. having trucks passing, and crosswinds can matter. how long was the vehicle running before the tests, was the transmission fully warmed? Or maybe the electric fan is coming on in the later runs, or maybe egr is active some times but not others?
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