Diesel consumption Actros new

Hello together, did or did someone else have the problem that the MP4 needs too much diesel at once? Before driving with an average consumption of measured 25.7 liters, I barely get under 30 liters for a few months. According to my records, this went from one week to the other. Load weights and distances are generally the same. I also have the feeling that it switches much less into the rolling mode, as before. Brakes are free. m current consumption I am on average still almost 2 liters above the consumption of my old MP2 with 900000 Km. Does anyone have an idea where the workshop could still look for or is there perhaps even a known problem somewhere? I am extremely grateful for every suggestion.