Search for your VIN in gtr-registry.com and see what it left with from factory. There's 4.3:1 and 4.11:1 diff ratios IIRC, can't remember what models had what.
Also could be tyre size, by factory the speedo reads a tad quicker >80 km/h but constantly out be 10 km/h is weird.
Maybe someone wound the odometer back, and accidentally bumped the needle up?
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