True. But I've noticed it with all of them not just a couple. The exact difference ranges from about 3-6 mph difference, all of them clocking me slower than my speedo says I'm going. I got pulled over for going 62 in a 45 about a month ago too. Cop says I was going 62, my speedo said 67 when I looked down after seeing the cop. Of course, he could have clocked me when I really was going 62, before or after I sped up to 67. Either way, again the radar registered less than the speedo. I don't mind though. I'd rather get a 10-19mph over ticket than a 20-29mph over ticket