What is even more surprising is the fact that the 2° diffusor helps.
On this kind of station-wagon-like rear ends - no diffusor at all ( 0° ) was found to offer the lowest drag, with a cavity, the diffusor helps another 6%.
A rear cavity is something that I could easily fit on Hägar.
A bit of foam and double-sided tape will do.
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Strayed to the Dark Diesel Side
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