Usually I only drive in the city so I noticed this over the weekend when I was on the highway in 5th gear:
I'm getting (what I can describe) as a dull buzz/vibration when getting up to (and over) 100km/h. I think its safe to assume that this shouldn't be occurring. It's more apparent when driving then it is in the video.
It doesn't seem to be related to the wheels (I put the clutch in at that speed and the noise disappeared) or the RPM because (Rev'ed the engine later on while parked and there was no noise).
Is this coming from the transmission? I just hit 5000kms and this is the first time I've heard it.