Just for curiosity: Any of you with A4 Avant notice a worsening of fuel economy when driving with roof racks attached to the railings?
Strangely enough I appear to burn 5-10% more fuel with them on, even if it's just the roof racks. Most of my driving is on the highway, avg speed approx 100 km/h (60 mph)
Any of you notice a difference? Or is just my imagination?
/Robert