The 5K I recently ran, the one I whined about here, was in fact longer than 5K! I was out last night with the Wednesday evening group, and I was wearing the hat I won at the Super 5K. Victor (a Running Fit employee and organizer of the Wednesday group runs) asked me what I thought of the race. I said, "Well, I think it was too long." He said, "It was too long."
AHA! I knew there was something to the fact that my Garmin 305 had measured the race distance as 3.21 miles. My Garmin may not be pinpoint accurate to the foot, but an extra .11 mile is a heck of an error.
I also mentioned how I thought it was odd that the race was chip-timed but there was a timing mat at the finish only. Victor agreed.
I feel somewhat vindicated.