My tv set up for better gas mileage

Believe it or not this set up, of my truck's side rails and cargo box, helped me a lot with my gas mileage on the first trip driving almost 800 miles.
The Sears cargo box is not as streamlined and small as a Thule or Yakima and I think that the size actually helped me.
I remembered that when I towed the trailer home from the dealer(4 hours) that my mileage was not great using just my truck with a vinyl cover on the bed only.
Barb
The Sears cargo box is not as streamlined and small as a Thule or Yakima and I think that the size actually helped me.
I remembered that when I towed the trailer home from the dealer(4 hours) that my mileage was not great using just my truck with a vinyl cover on the bed only.
Barb