I ask here in the round of renowned VW drivers and inside It has been discussed again and again in make thread here, but output I have not seen yet, therefore I would like to open up an own topic. According to up! drivers but also as shown under www.spritmonitor.de , probably with many drivers , there is a deviation of the BC to the real consumption. so on average by half a litre, that are expressed in % with the low consumption already worlds… I ask so stupidly, because with my old Smart, I had retrofitted a BC and it also showed deviations at first. but there I was able to adjust again and again by a few %, until after approx. 3-4 refuellings then quite exactly tuned… So, is there any possibility there to adjust something? LG from Vienna