What part of the country do you live in because I think that has some weight in the discussion. I drive the same speed regardless of the time of day but find that anything less than 15mph over the limit will not even bat a lash on a waiting cop. If the limit is 55, I'll go 69 (tee hee). 65 = 79mph. No issues in 15 years using this formula. I know other parts of this country are different but the bottom line is to not be an outlier. That's where you run into trouble.
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