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Good work! I've been thinking of doing something similar on the back of my Golf. Testing is the only way to know if you will get any benefit. I have a Scanguage but I prefer coastdown testing. It seems quicker and more accurate to me. I have noticed that if the wind picks up it really throws things out of whack.
Let us know if you get some good A,B,A test results with your Kamm back.
I know you want some taper to the top and sides but it's hard to see from the photos. Also, since your sides are set in from the high-mounted taillights the total angle should be measured from the outside edge of the car to the end of the side panels.
Happy Modding!
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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