Are you hearing any kind of unusual sounds, maybe specifically at high speeds? It could be a plethora of things and my first look would be at non engine related issues. Something like stuck bearings would become apparent at speeds over 80 (or manually turning wheels after it is jacked up).
Considering how low milage it is, maybe try driving it a bit more spirited and get it up there in the RPMs (after it is fully up to temp). Also we are not talking about the 1.5 turbo, right? A clogged turbo could also benefit from some additional pressure of spirited driving.
A general tuning may help, servicing the plugs and cleaning the throttle body.
