Sometimes it's just not your day. The intent was to do 31 miles, but at mile 22, I gratefully accepted a ride back to my car. Details and photos (from before the race when I was happy) to follow. Actually, I'm very happy now, warmly wrapped in my fuzzy robe at 3 in the afternoon. I feel a nap coming on... :)
Note: After checking the runners handbook for the AR50, it looks like I ran 22, not 23 miles. I've changed the title of this post and my running stats accordingly.