I took a few pictures today on the way out to the beach, and gathered some numbers.
The last half tank of mixed driving(truck only), 60% highway got me an all time high of 21 MPG!
I took the rig across the scales and it is at about 17,800 GVW with full water and some tools. I aired up the tires before starting out, higher pressures than before.
I'll record the time the trailer is off the truck and re-figure that at 18 MPG per mile. It is all at 25~35 mph, less than ideal speeds.
My last trip like this was at 14.9 MPG. I hope to establish a good "B" mileage before starting the mods.
Profile: I see a fairing hitting the high point and continuing aft, parallel to a point I'll have to figure out.
It will start following the template at that point and just clear the edge of the roof at the back, so it will have an angle near the maximum at the back. It will go about 1 foot aft to form a Kammback. it will tie into sides that extend 1 foot aft with the recommended 12 degree angle.
I can then build the boat tail and keep it short, say 6 feet long, but will have good wake reduction due to skimming over the edge of the roof as planned. I can't bend the sides in any steeper but I can do quite a bit with the top this way.
The front view:
That forward vent monstrosity gets a new housing. This view illustrates the challenge of the front wing, with the truck considerably narrower than the trailer.
Don't even talk about the mirrors they are not a negotiable item
I do believe the wing/deflector up front will pay some since it is a good 3.5 feet from back of cab to front of trailer. I get some 'bonus' frontal there, I think.
Aft view, illustrating the curvature of the roof.
Here is a high res of the profile, in case somebody with photoshop skills want to take pity on me
http://i810.photobucket.com/albums/z...rucking004.jpg