I've got speedo issues with my F-250's, too...because of larger than stock tires. One is off by about 7mph, and the other by 10mph. We usually stay within 5 of posted speed, or just go with the flow...no need to attract more attention to the lifted beasts. LOL
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 1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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