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The grade of gas you put in should not damage it whether it needs higher octane or lower. The computer should detect the higher/lower grade of gasoline and adjust ignition timing to match.
However, I remember some of the V8 guys saying that their car was stuck on the 87 octane ignition tables even though they put only premium in. This is because the dealer put 87 in for the first tank and the car never relearned for the higher octane. My advice is to just stick to what's in the manual, 87 is cheaper and without a tune you probably don't get much in the way of performance from higher grade.
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2011 Dodge Charger
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