My garmin showed exactly 4.20....
Last year mine said 4.18, this year it said 4.17. So I can't argue with 4.2.
I CAN (and do) argue with 4.4 however!!
I'm curious as to how long the "2.5" mile race is, also. The winner had a time of 12:01, and that was supposedly a 56 year old lady! (Yeah, right ... sounds like a case of giving her chip to someone else.)
But if that time is right, even if the person isn't right, that would be 4:48 per mile. Not impossible, but it seems kind of unlikely to me.