Wanted to revive this thread to ask a related question about the stock tune. I am back on the stock tune for the winter, and I switched back to 87 gas to save some money, figuring that I don't really need the extra performance of 93 in the winter. The OAR has dropped to about -.45, which was not surprising, but I still see negative corrections and some occasional knock, especially under partial throttle. Just wondering if this should be concerning of if it is typical of how the stock tune manages corrections on 87 octane. I would have thought the OAR would just adjust further so there wouldn't be substantial corrections or knock, but maybe not. For what it's worth, on the COBB Stage 2 tune with 93 I rarely ever had negative corrections and almost always have strong positive corrections.