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Old 12-16-2011, 08:41 AM
erm
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Don't run an octane tune that has a higher value than the fuel you are using. So don't run 87 fuel on a 91 tune. Octane values vary by area. It won't hurt to run a higher octane fuel than the tune value.

There is an extensive Predator document library here that may be helpful:

http://www.ramforumz.com/showthread.php?t=43559

It was initially created with the 5.7L & 6.1L LX cars in mind but is still relevant for the trucks.
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