Well my wife saw it and basically said "bleck!" Hmm . .
Regardless, I might still build it as a proof of conecpt whether she likes it or not. No doubt I could sell it to somebody else if it returns a solid 20% on fuel economy.
My other concept is more like the Hummer military fastback style, but I doubt it would return the same efficiency. Most likely somewhere in between the boat tail concept and a tonneau would be my bet.
The mirrors are definately a sore point, contributing nearly 2 full square feet to frontal area. I suspect the impact to aerodynamics isn't quite as bad as that sounds however given the vortecies they likely spoil off of the A-pillar, but I'm thinking our next long distance highway trip will be with at least one mirror folded.
I've seen unofficial drag coefficients from .45 to .53, so it can't be good either way. The .45 is for the previous body style and Ford admits to working over the engine fuel mapping to make up for the inefficiency of the new design, so I'll put a WAG as .48 for the 2WD, perhaps as much as .50 for the 4WD given the extra height.
Regardless, lowering the truck 3" would reduce frontal area by over one square foot alone, nevermind what affect it has on airflow underneath.
Yep, the Bully bars definately stick out a little. My thought is that if I can get away with lowering the truck, the bars can go. Until then, it's just too much of a step to do comfortably and difficult for the kids.