Update:
I think it's a wheel bearing. Why? it is almost on most of the time starting at 20mph and up, most noticeable between 20-50, not engine or RPM related at all and more pronounced while turning left. BUT, it's not the commong whirr whirr that people tend to describe but much like a heavy bus or truck on smooth pavement going fast. That Whiny humm, wooo wooooo sort of noise. Could it be something else?
