The main issue with the update is not really the fuel increase. It is the wear and tear on the emission system. Many drivers have already experienced failures in the regeneration system after the update. There is a real scandal brewing for VW group. There is a special facebook group for this topic. See also https://www.hypermiler.co.uk/dieselgate/the-volkswagon-group-is-systematically-refunding-owners-for-egr-failures-after-the-emissions-fix
We had an EGR failure and if was repaired for free by the local Skoda dealer, but they did not elude to this being a general know issue. Found this out after doing a bit of research on the internet.
