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Flush with cab and tapered toward a point at the back, yes. Level all the way back, most likely not (likely make things worse). The tapered ones are good for somewhere around 4% better FE.
A tanneau cover is a good option, they improve FE. You can even make one if you want. You could also buy the cap and cut it down to make it an aero cap if you wanted... just remember, smooth transition to no more than 15 degrees.
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