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It’s a 2nd gen, it’s also 91 octane, thanks 🤝🤝🤝

I’ve been looking everywhere online and talked to people but can’t seem to get a final answer. I was trying to see what the highest and minimal octane rating of gas I can put in my extended cab 2500hd 6.0 v8 sierra. If anyone has an answer I will be thankful as hell. 🤝