On my passat caravan with over 230000 km emiadetly start to spend 9 liters on 2002 Volkswagen Passat

i just cleaned the turbo because it couldn't rach even 60 km/h and now it spents 9 liters but it goes ofer 190 km/h. it has all service done, like oil,air, fuel filters all changed. please tell me what is wrong because it should spent 6 liters as in catalogues says?!

Asked by for the 2002 Volkswagen Passat