Quote: do you guys know anyone that has put a air wing on top of the cab and did it help with gas milage? and what was mpg gain?
Those things are high dollar! You would probably never save enough in fuel to pay for it. . (14 mpg highway)
Those air foils can be built cheap, all you do is buy the spars and cover then with aluminum and hold it together with blind rivits. I've built a few for race cars. Don't know how much they help on top of your truck but I would never buy a new one that was prebuilt, you will pay top dollar.
