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I always do 15-20 over the limit on the expressway. Usually set the cruise for 17 over (4.5-6 mph speed-o-meter error) I figure that puts me around 11-12 mph over and I've passed cops and never been pulled over. Jinx on me, I'm sure.
Of course, there are no rules on 80/94 around south Chicago and NW Indiana. Sometimes doing 70 mph in a 55 zone will get you run over.
On local streets, I do 10 over the limit (including same speed-o-meter error) I've found the error to be around 4.5 mph while in the 30-50 mph range. Never had a problem.
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