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Is this not EXACTLY what the burst knock retard table is for? Pulling timing for expected knock...
It doesn't retard timing, so much as it slows timing changes to give fueling a better chance of not going lean.
The ecm never KNOWS what octane fuel is in use, it just interpolates between the High & Low Octane spark tables.
Both methods were used during different times of the day, and under different driving, idling, and temperature conditions. You can also use a decibel tool too.
You can always check your mileage with traditional math calculations. I have a Fuelly app that I log all gas purchases for my last 3 vehicles. Sometimes I’m better than the computer indicates, sometimes I’m not.
yo' momma..... Just kidding, my friend. Not sure what kind of answer I'm supposed to give you on that one, seeing as some electronic tools are meant to visualize or audibly provide readouts.
Did you see any knock with the scan tool while driving with low octane fuel at WOT? If so, how much? That's what I mean.
To that, I would say no. There was no significant difference in noise, that would cause for alarm. Is there noise coming from the engine bay, yes, but as you'd expect for a 22' vehicle with close to 60k miles on it, that's the kind of wear and tear you'd expect to happen.
