Just curious if you folks out there with roof racks have noticed much of a decrease in gas mileage with your roof racks. I currently have a Yakima system with a fairing (wonder if that "helps") and honstly, I didn't check my gas mielage before I installed the rack. Now I am debating putting a roof rack on my new SUV (I would hate to add to the fuel efficiency problems of an SUV!). Have you all noticed much of a difference?