Gas mileage and roof rack

[Huntski]

Anyone running a Thule or Yakima roof storage carrier? If so, what kind of mileage you getting or notice a big drop?

 

[YellowLab]

Anyone running a Thule or Yakima roof storage carrier? If so, what kind of mileage you getting or notice a big drop?

I have the Overtrail rack; milage stinks now matter which rack in on this.