I used to play that
In high school, if I could find a suitably boxy truck to get behind, I would ride with traffic on a road that had a speed limit of 35, so of course most traffic was 40-45. Remembering when you were approaching the spot with the potholes (and frequently large chunks of asphalt freshly knocked out of them) was more than trivially important.
Also used to do it on a '73 Yamaha RD350 on the Jersey Turnpike. That's a small two-stroke twin that was 13 years old at the time, and a stretch of highway where there are no shoulders to speak of and traffic does 85 with just over a car length of separation. While I could cruise at 85 with very little throttle, it didn't occur to me that I was riding an air-cooled bike way faster than it was designed to cruise, while starving it for fresh air. All this came into focus when the engine seized in the left lane with trucks in front, to the right and behind me.
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Microsoft offers them the one thing most business people will pay any price for - the ability to say "we had no choice - everyone's doing it that way." -- [link|http://z.iwethey.org/forums/render/content/show?contentid=38978|Andrew Grygus]