I actually did do this as well. But you could be right that it had not adjusted. Oh well glad to have the correct tune coming in. Hope it’s faster than JB4 for me too!Without resetting the ECU, it was likely still anticipating the low fuel quality and would have continued to adjust and allow more power the more you drove it if I were to guess. With any fuel change like that it's recommended to disconnect the battery and let it sit for at least 5mins.