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Good question!
I posted this similar answer before for another who diddnt really understand the question much less the answer.
All engines are designed to hit marks in performance then detuned to match requirements and meet warrenty expectations.
For the most part F/E was always back seat here in USA to torque and H/P.
IMHO it still is.
SO in your case WOT is not the sweet spot as fuel map becomes Linear untill Rpm is reached and Torque curve meets HP curve or just past that point.
In gas sucking pig cars Like My KIA the Torque curve begins at 1700 rpm and then fuel gets optimized.
In my Dodge Dakota R/T the foot goes down till I feel Gs. build then after 2900 rpm it is just sucking down fuel for fun if it diddnt empty the tank getting to there. Look into your calculated gear ratios and then read a baseline dyno sheet for your truck that will be enough to get you very close.
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