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The adjustment is for a complete fill.
The SG tells you how much gas it thinks you put in to fill up based on the OBDII data it collected since the last fill up. It has no way of knowing how much gas you really put in.
You didn't fill up, so you shouldn't change anything. Just press fill up to reset the counter, and do nothing else. That way, the next time if you DO fill, you can calibrate it.
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