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i did a quick measurement off the rear windshield/roof angles of some sub 0.29 Cd car profiles and most where somewhere between 15 and 16 degrees. most also had a little vertical spoiler or simple trunklid like structure just before the end of the car.
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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