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Every vehicle that I have owned and checked out with GPS has shown speedometers that were optimistic - BMW X3, VW Passat and my 986 Boxster. If a manufacturer has to allow for a margin of error, it stirkes me as obvious why they would prefer them to overstate rather than understate the speed - just think of the potential liability issues if the owners of a particular car were all liable to receive (and in many cases were receiving) speeding tickets because their speedometers read 55 when you were actually doing 60!
Brad
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