Who can help me???

Hey people , I have problems with my Ommi . The fuel consumption simply does not want to be less! I have cleaned and renewed everything already what goes e.g. the AGR , cam crankshaft sensor ,Zündkabel ,Zündkerzen ,Zündspule , Luftfilter ,Vergaser ,Injection line u.s.w. I do not drive fast (Opa driving mode) Landstr. 80 km/h that is my daily work path but nevertheless my break is at 10-11 Ltr. on 100 km. There are also no gasoline odors or petrol stains. shows my display in the car completely wrong things in the stand 0 Ltr fuel consumption at 80 km/h 2.4 average consumption 3.6Ltr and with 20 Ltr fuelling a range of 800 km. I would be very happy about helpful tips!