Here is what Tracy (SC2150 on the forum) from RevXtreme had to say about the LFX octane tables in
another thread:
Quote:
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On a L99/LS3/LS7/etc. if you run 87 the PCM switches timing tables to the low octaine tables and the performance/economy suffers as well. It is marketing that dictates the fuel as the V6 is considered the "entry level/economy" version of the camaro/caddy CTS, etc. Same with the cheap oil. Why in the world would a lower grade oil be reccomended in an engine that is far more susceptable to wear and damage due to the timing chains/tensioners when using a premium full synthetic eliminates the issues? The LLT with the Bosch ECU is constantly adjusting timing based upon spark knock (detonation) it reads. If no knock, then it runs full advance where the engine performs at its best both power and economy. The LFX with the GM PCM has the high and low octaine table not unlike the V8's so it will default to the low octaine and stay there unless reset or so many cycles of no detonation triggers it to high ocatine tables.
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He has also stated that to reset it requires a tune, but it was also mentioned you could try disconnecting the battery cable overnight. I don't think the 5/20 fuse pull does anything, though, for the LFX.