Car sounds clean , shifting and boosting like it should, oil & filter new . The diesel filter never gets replaced when serviced unless you ask them and check after that it was done . With that been replaced you should see a better return , but I cant see that been the only cause fr such high consumption.
Have it changed , get a diagnostic done and hopefully it picks up something silly that's a easy remedy . Let me know the outcome .
Have it changed , get a diagnostic done and hopefully it picks up something silly that's a easy remedy . Let me know the outcome .