Did you ever figure this out? I noticed the same thing on my 04 XC. Turned out part of it was bad tires (cupping on all 4 tires.) They were Hankook Optimo. Only 13k on tires. They produced a bit of a rumbling sound. I replaced them yesterday with Continental contact tour Plus. Now I hear more of a whine at starting at about 55 mph. Nothing loud but its there. To test bearings I swerved left to right at lower speeds but no change in sound. I just replaced the differential oil but it still seems to be there. Bring to dealer later to have them listen.
IF IT AIN'T BROKE - DON'T FIX IT!
04 Volvo XC70 5LT 143k "Floatey" Ruby Red, Valvoline 0W40
07 Honda Accord V6 120k Silver, Napa 5W20 Blend
07 Honda Accord L4 130k Bronze, Napa 5W20 Blend
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