Update!!!!! Picked up a new piece of towing equipment today.

Update! Well on our trip out i drove 2 hours on secondary roads at speeds between 55 and 62. I averaged 8.4 mpg on the overhead console I normally average 6.8! Even hand calculated so i know the overhead is accurate. I also noticed the X wad able to hold OD for a much longer time, even on some NW IL rolling hills. Usually the X will run in 3rd with even the slightest headwind! I'm going to fill up before heading out and check my mileage by hand.

So far so good!

Another update. I just filled up for the drive home tomorrow and i came up with 8.7 mpg! Now a couple tenths of that is due to me filling up before the trip, about 25 miles from home with no trailer! So my 8.4 pretty accurate. A 1.5 mpg improvement is substantial!

My thought would be the closer the better. If you look at the semis they almost overlap the trailer.

I believe placement of the wing is critical. It needs to be a certain distance from the trailer to be effective. Don't know what that distance is.

Thanks guys. maybe I can talk the DW into letting me put a mural on it! LOL

And even if I get .2 MPG from it it would be worth it!

I`ll see if it works this weekend.

My dad uses one on longer trips, he claims about a 1 mpg improvement. He's a fairly detailed engineer and I believe him. He's been able to compare it on many long trips. His is bigger and is for his 5th wheel, it is a pretty big curved aluminum model. He was told to adjust it to keep about 1 foot of bugs on the upper part of the trailer and that is what he does. I think most of his testing was with a 6.0L Silverado and a fairly tall and vertical Cardinal 5th wheel. He now has a Duramax and a more aerodynamic Cougar 5th wheel, he still uses it on longer trips but I don't recall how much testing he did with it on and off.

But if you put on advertising then you become "commercial". :)

I hope it works out well for you. If it doesn't , you can always sell advertising space on it to recoup your loss!:W

Ya I've seen those on the car transports (the ones that haul private cars).

Lately I've seen a few semi trailers going down the road with tailcones. Looks like they fold up against the back doors when the doors need to be opened for unloading.

So in addition to the wing i'm going to need a 10 foot tailcone? Where do i get one that fits my trailer? And will it look goofy?!!!