I bought the 94 from the Petro down by Seaton. I mean I always had a bit of low RPM knock in the 91, and since putting the half tank of 94 I noticed the low RPM knock has almost gone away completely but then everything else is shifting now. I noticed fine knock learning twitching about this morning even at low RPM putting around my neighborhood. Could I really have gotten that bad of 94? How long did it take for your DAM to stabilize? Should I reset ECU?
Petro 94 is generally regarded as "meh". But you can get a bad tank anywhere, anytime. That's what knock sensors are for.
The ECU has responded to knock, so a reduced DAM is a good thing. Less timing advance for more safety. Resetting your ECU will usually return DAM to 1, which is a bad thing if you really do have a bad tank of fuel.
For the DAM to return to 1, you need to meet a few operating parameters. Generally, easy driving and highway cruising will not cause the DAM to change.
If I were you, I'd let the ECU do it's thing for now. Drive around with the reduced DAM, burn through the fuel you have, drop the tank as low as your patience allows, then refill with the fuel you were tuned on. Keep an eye on knock, and assess.
If boost is lower in Sport than Sport#, leave it in Sport. Don't be scared to accelerate, but avoid long hard pulls.
And always, if you want more assurance, contact Lakeview.