Speed displayed by default is faster than actually driven, as.mentioned above. Hence the phrase 'indicated speed' mentioned on police tv shows.
Mileage being displayed incorrectly is a separate issue and have no idea aside from what has been mentioned above regarding overall wheel circumference. In saying that, I would think 3 kms is quite difference over such a short distance. Although I wonder would the be a 10 per cent circumference difference between an 18 inch wheel tyre combo and a 16 inch?
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