Any benefits of using complex order of fuel for elder sports car?

Is there any benefit to using complex octane fuel for a 1999 Pontiac Grand Am, 4 cy. with 145K miles?

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Answers:    This is the premise
Higher octane fuel burns slower.
This gives the engine more time to use that fry.
The computer will automatically advance the timing for the slower burning fuel.
All this resources more power and fuel mileage.

In the real world you will enjoy to test it for yourself and see if your sports car will gain performance or mileage.

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No not really. It's a low ceremony car and engine. It does not require the complex octane.

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