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I did a coastdown test on my Scion, and my method of data collection worked well, I think: I video recorded the SG II set to KPH. I paused the video at the instant the car reached the 70KPH, noted the time, moved 10s forward, and noted the speed.
There is no bias.
The challenge with this is to "know" the Crr in order to get the estimate for the Cd.
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