Vibration
 

Hi All,
purchased new 2017 left over XC90 inscription, loaded great car except at 60 plus MPH there is a vibration.
brought it in 3 days latter and they speed balanced all four wheels , still the same issue. brought it back after they had it all day I was told to come in and go for a drive with the service manager which I did him driving got it up 90 MPH and at this point the vibration we are feeling is in his words, Road feed back. city driving is fine although I drive 100 miles per day round trip highway consistently at 70 + MPH.
Any help will be greatly appreciated.
currently have 2500 miles on it.

Thanks in advance.

It could be a drive axle or driveshaft imbalance. As an alternative, a bent wheel will balance perfectly but will give a vibration due to wobble.