[JulianEdgar]

Originally Posted by j-c-c

Yes, I am aware of that, but you (?) shared that the truck pictured shared the approx similar converging you used on your test vehicle, but your test vehicle had a varying cross section air foil, and a turning vane in many cases I believe does not have an inherent need for a typical airfoil wing crossection, as it by design has to add drag for little gain, when used symmetrically opposed vertically on the front of a vehicle.

So my question still stands, were the vertical turning vanes on the front corners pictured recently in this thread on the front corners of the semi truck, of a uniform cross section?

Yes