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swear to god i never saw that site, but good, means i'm not crazy after all,
after reading the website, i can concord that the steepest part of the graph would be the aerodynamic drag in function with speed, the less steeper would be the Drag coefficient and rolling resistance so a good graph can actually provide a lot of info if you analyze it correctly, the good thing is that finding the weight of your car is not so difficult, most have it on the spec and there are a lot of scales you can use (if you know the right person) speed is measured by the speedometer, so you have another data, avilable, so you can find out everything else by that
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