Quote:
Originally Posted by strych9
My current understanding is that 91 octane places the ECM into its highest performance mode. 93 octane is not programmed into the ECM, so its use will make no direct increase in performance over 91 octane.
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I just found this in the manual...
Required Fuel (ZL1 Only)
If the vehicle has the 6.2L V8 engine
(VIN Code P), use premium
unleaded gasoline with a posted
octane rating of 91 or higher. For
best performance, use premium
unleaded gasoline with a posted
octane rating of 93.