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Will this damage my engine?
No. The PCM/ECU will detect any increased KR (knock) and adjust the timing accordingly. You will not get the normal performance from the engine with 87 octane ... so I would refrain from any WOT acceleration. But normal driving should not be a problem. You can wait until you're half tank and fill with a higher octane; either the recommended 89 or even 91.
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You mght have missed the car & driver article about using lower rated octanes than recommended. One of the cars they tested was a 5.7 liter Charger, which is supposed to get 89 minimum. They ran 87 with just a slight decrease in performance. How ever, I have tested all of them and I can't tell the difference between 87 and 93, but I can feel the difference when I run 87. It feels like it hesitates, probably while it's adjusting the timing. So I run 89 all the time. In short, no you won't ruin your engine, but you might notice a drivability difference.
 
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