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Originally Posted by E90Fleet
Our local car magazine uses a calibrated wheel that is attached to the car to detemine speedo accuracy, and I can tell you there isnt 1 car that is 100% accurate, no matter what the make
1 or 2 cheap makes overread soometimes, but the rest always underread.
Also you can have a 100% accurate spedo on 1 set of tires,but wear those tires down a bit or change to a different make of tires and the reading will be different
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100% accuracy isn't expected, but 99% accuracy is expected and would be acceptable. 92% - 94% accuracy is unacceptable.