http://forums.13x.com/index.php?threads/cost-of-racing-airtabs-review.245901/#post-2943577 My Air Tab experiment. Short version is a little over 2% improvement on an F150 pulling a 6 x 10 flat front trailer. Probably within the measurement error. They look cool though.
Rounded corners and nose cones True, do the math on the cost of upgrade vs gas savings. If 10% generates a positive ROI for you...