Fwiw... We only use shell. On our second trip to the Dyno we filled up at QT and lost over 20hp. The logs showed the ECU pulling timing liberally...
Ran that tank out, filled up with Shell again, gave it 3-4 drive cycles to get fuel trim adjusted then re-dynoed... Power is back.
My anecdotal example is just that, but I won't be straying from Shell (or Kroger since it is the same stuff and has been confirmed on the Dyno).
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