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Slow speedo on Subaru Impreza

Asked by Allan Cowin

When my daughter compares the speedo in her new Subaru Impreza to her GPS, which we know to be accurate, the Subaru is reading 8 km/h slow. She has checked it against the highway speed checkers and got the same result, so she has endured 900 km of road rage with everyone beeping her or overtaking her on blind corners etc. with a few near misses before reaching the Hume. Subaru told here it's the Government's fault, that the ADRs are causing her problem and that it's illegal to fix it. Maybe she should have bought a car that complies with the same ADRs and is within one to two km/h of the real speed, like Ford or Holden. So much for Japanese precision!

Answered by CarsGuide

23 Dec 2010 Carsguide.com.au

The ADR demands that speedos not read slower than the actual speed of the car, but they are allowed to read up to 10 per cent faster.  Your daughter's car falls within that tolerance, which makes it legal. She now knows how far out the speedo is, so she can adjust the speed she drives at accordingly.

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