Got out the yarn and duct tape yesterday and hit the road. We have been seeing 23 to 25 mpg in over the road testing. The air flows nice over the top. The sides, a little to be desired but did not want to eclipse the tailights. The turbulence of the wake seems to have been reduced as shown by the laziness of the tufts stuck on the very back.
This new device is held in place by the rotary latches in the lowered tailgate. To remove it, just reach under and pull the tailgate handle which releases the rotary latches.
Thanks,
Bondo