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Don't worry about it, as always people become corvette hypochrondiacs.
All that will happen is that the cars computer will pull back the timing on the engine and you will lose a little performance. I think you are concerned about availability and not price. You will be 10000)% fine with regular.
I have ran into the situation where I had to run regular.
No knocks, no pings, but no performance. But that is the only bad side effect.
No extra ware. no fires, and no flying monkeys.
Be careful driving with all that extra gas in your car. I would not set the AC on recirculate and would probably drive with at least the windows cracked.
Heed this advice... Ever hear of a water heater blowing up a house when someone was using gasoline to do something?? It's the fumes man...Keep those babies capped tightly.
The LS1 engine was can run on 87 or greater. I've ran 87 before and it ran just fine. I went back to premium, because for .20 more a gallon or $3.40 a tank, you might as well run the good stuff.
Here is what the manual says.
"Use premium unleaded gasoline with a posted octane of 91 or higher for best performance. You may also use middle grade or regular but you performance may be slightly reduced. If octane is less than 87, you may get a heavy knocking noise when you drive. If it is bad enough it can damage your engine."