Alan,
I would imagine the new counter is similar to the old - 23.333 clicks per revolution.
I, too, have gotten within a click over a 5k course, so I know it is certainly possible. It just looked like maybe you had lots of potholes to dodge, which would have varied your path.
I have had a Jones die on me. Visually, nothing seemed amiss. But, on the Cal course, I had anywhere from 800 to 1200 extra clicks. The gears inside had broken, so my counts were nowhere near accurate. Glad it was a Cal ride, and not a course! But, Jones counters can go bad, too.
Good luck!