We always recommend running matching fuel and calibration octane ratings. It doesn't hurt to run higher octane fuel than the program calls for (93 gas in an 87 Tow or Perf. program), but don't recommend the reverse... low octane fuel in a high octane program. Doing so can cause detonation and may ultimately lead to engine failure by way of melted or cracked pistons.
Most of our customers have indicated that for day to day driveability, the 87 Perf. programs work extremely well with 87 octane and provide good response and economy. The biggest difference in the 93 Perf. program is going to be noticeable above 1/2 throttle so unless you are a hot-shoe (like myself...), you won't see any significant difference in normal driving.
Hope this makes sense.
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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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