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Wman455 : thanks for the comments and pics.
Correct and understood, that pressure influences perpendicular to the surface... Pics I made was purely to illustrate what I was trying to explain earlier (and did the pics fairly quickly). And yes, I am in midst of doing my own measurements but wanted to check over here if someone has info how pressure changes on the rear of the car impacts to drag / fuel economy, especially cases which I tried to describe (shallower rear angle, yet still attached flow -> spoiler impact to pressures / drag / fuel economy?
So based on your pressure measurements as mods on your spoiler impacted to the rear window / area surface pressures, did that help on fuel economy? And if did how much?
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