
Originally Posted by
jut703
My car reads 206 kph at 200 kph GPS. My thoughts on conservative speedometers is this - most cars have a ~5% tolerance built in their speedometers, so even if it's not exact with the GPS speed, someone doing "180" with his car will be overtaken by another guy doing "185" in another car, even if their real speeds are just 170 and 175 respectively. Unless your tire size is wildly different from stock, the gap between GPS speed and speedometer reading is mostly the same across different cars.
Very, very few people use a GPS-based speedometer so comparing using true GPS speeds as baseline reference is ultimately alien to everyone who doesn't time cars for a living.
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