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  1. What might cause a speedometer to consistently read 10% low?

    Gen 2: 2000-2004
    Firstly, this issue cannot possibly be explained by tyres. I've owned the car since 2012 (MY00, 290,000km). The speedometer always read about 2% higher than actual speed, which is normal in Australia. I regularly swap between two sets of rims for summer/winter which, while not identically...