I do! I have a Thule and when I first got it I didn’t have the fairing. Well within the first few miles I already noticed that my gas mileage had dramatically gone down. My little Hyundai was getting 24mpg with the new rack.
The actual bike holders/trays are made by Swagman. $60 for the set and I’ve had it for 3 years now…not a problem with them!
But after getting the fairing, my gas mileage improved! I’m now getting about 28mpg. I got a killer deal on my fairing since I knew someone that was able to get them below cost. Usually the fairings are around $50-$60 from your LBS or anywhere on the Internet.