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I don't think you will do any damage. The octane rating is an AKI rating (anti knock index). With computer in you 4.4 , it will sense knock and adjust timing to prevent it. The rsult is poorer fuel economy an dreduced performance. But, if you can't find premium fuel, I don't think you have to park it in the driveway out of fear you'll ruin the engine. I think the extra gunk comment, is well, just bunk!
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