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Sorry about the picture , havent quite figured it out yet, I test on a three mile long hill , starts out steep and then very long even grade where I usually max out at around 50 mph , so far coasting at 51 or 52 so seems a tiny bit better, plus brought my mpg back op to almost summer levels 39 , was averaging around 37 38 in summer 40 , on the truck the hood bump it seems could be made out of wood with triangle or moulded edges by the fender line, I thought about using a conical section so the air spills off the sides, I am going to partially cover my bed on the ranger, seems if you cover just the rear 1/4 of the bed it helps a bit and should be pretty easy to bolt on , probably hang the back edge of the plywood past the tailgate a foot to extend the airflow, pretty cheap to try anyway.
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