I got just over 17 on part of my drive today from St. George Utah to Las Vegas... thats doing 80mph with Cruise set... I have a modified 80HP performance tune that I was running.. your highway MPG's work best with higher ICP and shorter injector pulse width at least that is my understanding from Bill... I also got 15.5 running up the back route from Colorado springs thru Breckenridge in 4wd yesterday in a snow storm which includes going over 11000+ ft pass ...
I think Im gonna have him Live tune my truck at Bandimere this year for a high altitude super cruizer MPG tune and see what comes of 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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