i read a while ago in bike magazine that bikes often show 10% higher speeds than actual speed. thats why they use GPS when speed testing as the spedo is never spot on.
my in corsa i can go through 30mph speedos in barnet at about 40! no joke. ive been flashed a fair few times (and been lucky), and the point for my car seems to be about 14mph over the limit at 30.
no idea how far it goes for faster speeds but ive never wanted to try it.
i dont think my speedo is anywhere near 14mph too fast at 30, i think its mostly the speed cameras, plus a bit of my car being over.
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