Not sure what options Bill has for the 6.4 but the 7.3 really does well on the 80 and 100HP tunes around town. I use the 100 quite a bit because it has great throttle response of the line and at light throttle. Crusing, I run the Fuel Sipper which is similar to the 80HP tune with some fuel and shift point mods... Plus my own mods I made to that tune. The 80 and 100HP are very similar if you are not laying into the throttle all the time.. There are several comment on the forum from folks who really like the 80HP for a daily driver
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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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