Granted, I generally do anywhere from 5 to 65 miles and hour over the limit when I can, but doing 45 in a 60 doesn't get me upset at the guy in front of me. I just keep my eyes open for a place to pass safely. And if my speeding upsets people, well, I don't have any tickets on my record and I've never been involved in an accident other than from the passenger seat, so meh.
There was this one time though back in high school where a guy sat at the front of a line of about 20 cars doing 40 in a 60. I finally managed to pass him (and the 5 or 7 cars between us) to make it to the front of the line. At this point I dropped it down to 20 miles and hour. Hehehehe. Of course when he tried to illegally pass me in a turning lane I jumped it up to 120 and took off. But I was thoroughly amused.