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Someone would have to be an expert of both the ECU reflash and your car to give an educated answer.
My car specifies 91 PON, but operates without issue and without any noticeable change in fuel economy with 87 PON. I'm just barely able to perceive lower torque at high loads running regular gasoline.
On the freeway, the car will advance ignition timing 39 degrees on 87 octane, but will run 40 degrees on anything above 87 octane.
I don't know what you drive, or how the reflash is programmed, but modern ECUs should detect pinging and retard the engine.
Last edited by redpoint5; 10-27-2014 at 10:02 PM..
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