It can get down into single digit overall advance which is a worst case, can't do anything more scenario. And pulling timing is a good thing for safety. But if you can diagnose why it's doing it and correct that deficiency you should make more power. That's where the gauge can keep you in the loop. Combining wideband, knock/timing, and maybe EGT and other OBD-II data can be a very powerful tuning aid.
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