Hi guys I noticed that the on board computer on my w204 model T om646 c200 shows false value of fuel consumption. One it shows 7.4L/100km but when I went to petrol station I tank 61 ON LITTERS which was 8.3 L/100km. Today I drove 222 km and the computer shows 5.9L but it burn exactly 15.51L which was 6.9L. Despite the fact that consumption is a little to high in my opinion the different between the on board computer and reality is quite weird. Once its 1.9l once it is 1l. Do you have any idea why is it that? I understand that on board computer can missing the really consumption but the difference value should be the same all the time.