The extended cab with wind tunnel tested roof arc might make the need for a roof wing or aero-shell less critical. However, they seem to be missing out on a lot by preserving the typical pick-up truck looks.
A Practical Guide to Pickup Truck Aero-mods
To make an accurate guess, look at another similar truck.
I could not find a Cd number for the two examples I looked into.
I mean they didn't even do a grille block and side skirts like this Ford below.
http://www.trucktrend.com/cool-truck...f250-scorpion/
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The truck’s final evaluation was done at Lockheed Martin’s 200-mph wind tunnel in Smyrna, Georgia, before the Super Duty was shipped to Bonneville.
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