Absolutely they need premium (as has the 350s and for that matter, most of Nissan's/Infiniti's offerings that use either a 6 or 8 cylinder).
If you use anything other than premium, you will likely see less performance as the CUP backs-down the engine to prevent premature ignition (knock).
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Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -
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