To Duane's point it's not just the record-setting situation why I think we need a upper % limit to course length and still call it a certain distance. I have running buddies who choose to run a particular race with a certified course because they want to, for example, set a PR or qualify for Boston or to get accepted to a particular college team. They are lead to believe that because the course is certified it is of accurate length - not too short and not too long either. They have no clue that there's a database where they can look up the certified map to check that actual course length matches the advertised race length though in my opinion, they should not have to. If a course is certified as a certain length, then besides being at least the advertised distance then it should not be overly long either. A number of us can cite situations where as either measurers or certifiers we been requested to call a 5K a 5K when it's not. For that reason, I'd like to see an official upper limit so I can say "Sorry, can't do that, it's against the rules".