Most of our customers have seen 2-4 MPG with just the programmer and a CAI. However, a few have had problems setting a CEL when running a CAI although S&B seems to be the least problematic of the CAI kits.
Mileage gains also rely heavily on which gears you have and how much of your driving is spent on highway vs. city. Lower gears (4.30 & 4.88) are always going to do poorly and the gains generally aren't as impressive as the taller geared versions. Also, 4x4 and dually trucks fare worse as well. Just some things to think about.
Hope this helps.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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