Mercedes mileage on dash

I have a GLC 300 2021 and noticed that the MPG estimator on the dash is less now. Meaning when I fill up the gas tank it shows 330 mpg on a full tank . I remember when I first got the GLC it was in the 400 mile range. Is this something to worry about?

It’s using past efficiency data to better estimate future efficiency performance. Normal.

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Thank you for this