Quote:
Originally Posted by mikeyjd
i guess they work since the readout can't lie.
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I know, I know that was sarcasm. But I'll give a serious answer.
When in grad school, I took a course in Dynamic Measurements. A whole semester studying all the ways that readouts lie.
Summary: There is no such thing as a readout, any readout, that is 100% accurate. There is only "good enough".
That's just for the readout. Don't forget the confounding factors: temperature, wind, speed, driving habits, terrain, elevation, tire pressure, tire wear, engine efficiency, ...