I've always had a "go with the flow of traffic" mentality, which is almost always 5 miles above the speed limit. There's a road I drive down constantly during the summer, and repetition has made it clear that everyone is going to go 50 when it's 45 and 45 when it's 40 when there is traffic.

Of course, this same mentality leads me to think, no one in front of me = DRIVE, DRIVE, DRIVE!