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speedo can legally be upto 10% out, usually under reads, but sure more of our cars (and some of the new trash produced) will be more than that
a speedo is only a estimate of the speed travelled , therefore no legal implications apply.
this is why a speedo is not part of the MOT.
manufacturers are under no obligation to make a speedo accurate.its just in their intrest to do so or people would stop buying them.
i have a motor bike with a pedal bike speedo fitted but its not wired in and gives no reading. (passed mot though)