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yup
speedos are usually off, and generally read high - the average 968 for example reads 150 when you are only doing 139 - it's pretty close under 100 though
GPS is usually off at high speed too - the delay time to the satellite almost always causes high readings at the upper end - it's because of the calculation that is done, and the refresh rate - i've "fooled" my GPS into reading 10mph high at about 120 - it isn't too hard - i didn't feel it was safe to play around beyond that - too many thing moving too fast to keep fiddling
radar is about the only way to measure speed, unless you can sustain it for a while, which is why the bonneville runs are conducted the way they are - i use a radar gun for my local stuff, and at the track
kids, don't try this at home - high speed runs are DANGEROUS - tires are extremely critical at high speeds
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