I think it only really matters when you are making a journey that is near the edge of the range – I cannot image I will use sport much – comfort is more than adequate for joining roundabouts or slip roads but I will be using the a/c on a low setting along with ventilated seats on hot days and at lower speeds the tilt on the sunroof is useful and not too noisy – I had an xtrail with sunroof anything much over 30mph and it made quite a racket.