That's what the article mentions, which is pretty amazing. Look at the short paragraph immediately below the photo on the red C6. Premium is recommended but not required. I myself had to run a tank of 89 octane fuel (91 or 93 wasn't available at one point on a long road trip). I experienced no problems, maybe a slight performance drop at most.
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'74 Stingray coupe, heavily modified, as seen in August 2011 VETTE magazine, 2014 Stingray Z51 #196, ordered 02/11/13, built 08/29/13, Museum Delivery 10/04/13, driven daily!
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