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Running low octane in our cars is not like some have mistaken and put diesel fuel in a gas engine. Like it was said above, GM designed these engines to run on 87. That's not the "recommended" octane but the computer will adjust to it. Your performance will suffer temporarily until you change octane.
I had a bad tank of gas in mine a while ago and I could hear the knock when I put my foot in it, so I just drove it easy until I emptied the tank, changed gas stations and pulled fuses.
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