You sure want to share the youtube link and the MDR-Interview some years ago of the retired engineer, saying that in that statement enough bogus was included.
Quote:
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We rarely see efficency like that even today and here.
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Like the Mercedes W124, also Audi was setting standards in Aerodynamics in the 1980s, which are not so easy to surpass even today in the SUV-Age.
But.. if you would have an similar sized car with an up to date Inline 4, you would get a pretty similar performance under an comparable setting.
Mercedes W212, Mazda 6, Peugeot 508, Insigna B... 2.0 HDI/skyactiv, 1.6 HDI and if you want to get "as low as possible" do the same like audi did, remove the AC, everything non necessary in weight, Pirelli P1 Verde, Michelin Energy Saver in a thin dimension with maximum pressure.
And... no particle filter, and fuel not diluted with biodiesel. We just need a long clean road without traffic, legal to use at 37 mph..