I was considering a tailgate, but decided against it. One must remember to lower the standard tailgate or there will be damage. So far after 5years I still remember to lower the tailgate :-). As far as fuel milage is concerned, I seriously doubt any improvement and it would take as serious wind tunnel test to convince me that they improve milage. Wind tunnel tests that I have seen on pickups do not justify bed covers and lowered stock tailgates. so I doubt they would show improvement with tailgate modifications. The cost of the tailgate can only be justified if one does not remember to lower the tailgate while hooking/unhooking up. If you do damage a tailgate it will cost at least a $1000 to replace it-- more if you have a step style gate that Ford offers. If one can not remember to lower the tailgate, they should increase their dementia medicine dosage.