All last summer I didn't run anything but Sunoco 104 octane GT+ race fuel. However, I had my EEC calibrations so agreesive, even in street trim with 10 lbs of boost, that I had to. I'm redoing my street calibration this spring so I can safely run 92 to 94 octane. At the track, I run C16 race fuel and have a completely different EEC calibration. Oh yeah, and I change blower pullies and run 16 to 18 lbs of boost.
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Dan McClain, Editor
The Mustang Works Magazine
1991 Mustang GT - NOVI Supercharged 377 Stroker
1999 Ford Lightning SVT - 2000 Prototype updated by Roush