I agree lugging is always bad. But these engines make so much low end torque that it seems in theory you could drive empty at much lower rpms than stock and still drive around fine. The followup to that is finding the right balance. And will it yield better, worse, or no change in fuel economy.
Hope Bill gets caught up soon so we can get him back on the forum and get his take on it.
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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