There's about a 10-12 HP difference between the two programs at mid to upper RPMs. For daily driving there's little, if any difference. It all depends on what you are looking to accomplish with the vehicle. If maximum high RPM performance is your goal, then a custom 91 or 93 octane performance program would be the ticket. If you are looking to make your drive to work a little more fun or just want to pick up a little fuel economy, then I don't think it's worth the expense for either the calibration or the fuel.
Hope this helps.
__________________
Bill Cohron - The Mad Doctor
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(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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