Speedometer Error on Purpose?

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I've found Fords to read high but the 2 worst offenders appear to Subaru and Honda as these brands always are doing 60 in the middle lane when everyone's doing at least 65. Definitely a ploy to run-out warranty early! This puts the Subaru off by 8.3% which is clearly unacceptable.
 
My 2003 Subaru WRX indicated 2 mph high. My 2008 Legacy GT reads 1 mph high.

Back in the mid '80s through the early '90s we ran a 24 hour endurance rally for motorcycles. Part of the check in process was to run a 10 mile odometer calibration leg. The BMWs were never more than 0.1 mile off. Every single Japanese bike, regardless of make, ran 8-12% high.

Ed
 
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