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IAM always starts at 1 immediately after a re-flash.
Also, it takes more than 30 minutes of driving for the ECU to properly learn all the fuel trims.
And one final thing, if your IAM falls, it won't actually increase unless the engine sees a specific load value. It needs to see several instances of constant, steady acceleration for it to climb back up.
For now I'd keep an eye on it and fill it with 93 going forward and see what happens.
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