If this one slipped by here at EcoModder, as dated as it is, it's still worth a look, and will look 'familiar', considering what's been offered by others as 'concepts', or production vehicles. Audi gives us the general exterior dimensions, which have value in their own right.
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Other cars which share similar fineness-ratio are :
1937 AVA Gottingen, 1/2-body, Cd 0.13
1938 AVA Gottingen, Schlorwagen, Cd 0.186
1985 ALPINE V-6, Cd 0.28
1985 Apollon, by Antoine Volanis, Cd 0.13
2005 AeroCivic, Cd 0.17 (est )
2019 Lightyear One, Cd 0.20
2020 Porsche Taycan 4S, Cd 0.22
2020 Tesla Roadster-II, Cd ?
2022 Tesla Model S Plaid, Cd 0.208
2022 M-B Vision EQXX, Cd 0.1716
https://www.audi-mediacenter.com/en/...he-future-9332