Help!!! Petrol consumption too high

Hello Leutte, hope you can help me. I have the impression that my TTC 1.8 consumes too much: on a straight track highway at a constant 160 km/h 14-15 liters, at 180 km/h 17 liters, at 200 km/h 20 liters (Super+). Will be displayed by the FIS, but also confirmed by refueling. Is this normal??? If not, what could this be? I got a new LMM a few months ago in the 24H3. Could it have something to do with it? Is it chipped or otherwise what is not tuned? s. Thank you and greeting valluga76