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![Anon](/assets/Uploads/_resampled/ScaleWidthWyI3NSJd/CMSThumbnail-SetWidth75-aa-avatar.png?m=1518003100)
Some Nissan models need the air-flow meter to be learnt when it's replaced but I am not aware of this for replacing the air filter as the air-flow meter will automatically have a different reading with more airflow going through the sensor.
I wouldn't suggest that you carry out any re-learning procedure as you don't have the diagnostic equipment to confirm whether you have correctly re-learnt the parameters.
But as I said in the beginning, your X-Trail's fuel economy sounds realistic.
![hiway2002](themes/aaAle/images/interface/profile-pic-placeholder.47cf740a.png)
All right then thanks a lot Donovan :)