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Mikes "try to get fired daily" comment gave me a good belly laugh.
5.4 is a decent motor, but of the big trucks in our family (excursion, '02 f250, and '97 f350) we tend to go big and think about economy later (v10, v10, 7.3 PSD).
Did you ever look into a programmer? I know it was suggested to me for my bronco and I could do all the tuning with a few downloaded items.