[tasdrouille]

You are not alone my friend. I too have this exact same problem with the TDI. I think the way the SG computes consumption for the TDI is flawed and is only accurate if you always drive in the exact same manner you did when you calibrated it.

BTW, do you have vag-com? My unofficial cable unfortunately stopped working, but it would be interesting to compare the fuel consumption reported by vag-com vs the SG.