In my 94 Del Sol, I had to take the cluster apart, pull the speedo needle off, and put it back on adjusted slightly. If the speedometer had been reading off by a percentage, that would have suggested the wrong tire size, but it was about 6mph high at 20mph, and 6mph high at 80mph, which suggests to me that the spring inside of it was just getting tired. After pulling the needle off and adjusting it, the speedometer, GPS, and odometer all agreed.
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