Good news
So it seems to be true that VW (and Audi) started to comply to OBD earlier than necessary.
Idle consumption looks OK, Euromodder and I both have the same engine (1.6HDi) and we both see idle consumption around 0.5 l/h.
You will have to calibrate the SGII at each fill-up, after a while it should be close its target. If not, you may try the trick with engine displacement reduction. Take into account that the ScanGauge is harder to calibrate with a diesel than with a gasser.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread