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With the 11:1 compression....

I'd you are just traveling, say, 200 miles, is it okay to run 87 octane? But, only 93 will let the engine person at it's optimum?
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Here's the 2019 Owners Manual for the LT1 engine. The LT2 is very similar.

Premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 93 is highly recommended for best performance and fuel economy. Unleaded gasoline with an octane rated as low as 87 can be used. Using unleaded gasoline rated below 93 octane, however, will lead to reduced acceleration and fuel economy. If knocking occurs, use a gasoline rated at 93 octane as soon as possible, otherwise, the engine could be damaged. If heavy knocking is heard when using gasoline with a 93 octane rating, the engine needs service.
Use the highest octane (up to 93) that is available. Different areas of the country have different levels available. 93 is everywhere in the DFW area. In higher altitude areas, octane needs are lessened and finding 93 is rare. Even in many low altitude areas 93 is very difficult, if not impossible, to find.

The ECM will adjust to compensate if engine knock occurs. The problem is that in order to compensate, knocking must occur. You may not even notice it, but the knock sensors will. Knocking is not good for the engine, so don't skimp on octane unless you just can't get it.
 
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