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While the ADR's do their thing, Australian standards require a car tested must show a speed reading within + or - 10 km/h at 100 kmh as depicted on the vehicle speedo at the point of new car compliance requirements.
In 15 years in the auto industry, I've never come across a car that when it says 100 on the speedo is actually doing 100. most are around the 92 to 94 mark and I cant remember one being over 100.
The gps might be accurate, but without calibration and evidence to support it, who'd know?
Darren
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