Novice new member here, just reading, trying to learn...............

Neighbor of mine has 04 1/2 SRW long bed, pulling BIG 5th wheel with what appears to be a lot of frontal area.....
Has one of those wing/spoiler air dams on top of his truck. He claims that has made significant difference in mpg (???)

ANY opinions on air wings/spoilers, their cost versus mpg gains

regards to all,

 

I had several customers towing a townhouse behind their truck.All of them said if air deflector NOT used it made a big difference in fuel mileage etc.For the worse.