I got a answer in Linkedin that its 0,210 so 0 is the last number.
Also underside is different in these a6 variants, if you put other cars underside to the other a6 model difference in drag is at least 0,02 Matteo Ghelfi commented on linkedin.
That just points out that the deflectors have huge impact on drag. And I think they are not using the best shaped deflectors which should be D style. That downward sloped deflector will still direct air to the tire which is like a shredder and will create turbulence.
More pictures in linkedin link
https://www.linkedin.com/posts/matte...member_desktop