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Yes, SAE-approved is well beyond DIY. The values I produced from the measurements are good enough to see that Cd of 0.287 is wrong by a factor of 1.9 ± 15%. Any measurement have a margin of error, and you can tell how much approximately it is.
Also, the maximum speed achieved by the car tells that my values are quite correct. So does acceleration rate.
What comes to Prius, the Cd of 0.25 is not right either, not even close. It's pretty much impossible to have that low Cd when we know the range in electric mode that has been verified.
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