Shouldn't hurt anything unless you are going up a long grade at wide open throttle. Your knock sensor system should adjust as well. As long as you do not hear constant spark knock, you should be ok. If you are worried, just baby it for a while, then top it off with premium.Long story short, I filled up with 86 octane about 7 gallons, was not paying attention lengthy road trip.
I know we are suppose to run 87, will 86 harm anything? It was BP gas.
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