This weekend I got my truck ready for it's maiden voyage to the PA woods for my annual hunting trip. This included borrowing a cap from my friend who owns a 97 3/4 ton GMC pickup. I must admit, the blue cap doesn't look all that well on my nice white truck but my gas mileage has increased dramatically!! I went from 18. 2 to 21. 3 on my first 40 mile trip to work today! I think I might buy me one of these air foils!!!