I have one as you can see in my signature pic. I got it from my dad when he moved to a motorhome. All I can tell is it helps to keep the bugs off the front cap. Last year when I was repairing the mounting brackets that were starting to break, I drove with it off several times and did not notice any gains in gas mileage. I did notice more flex on the front cap without it. I have mine on a special rack that bolts to the bed because I did not want to bolt it to the roof. It sits half way back behind the roof. The rack cost 175.00 and the wing would be over 350.00 if I had to buy it. So if I had to buy the whole thing I would not spend 525.00 to keep the bugs of the front cap, but it looks cool.
