I dnf'd the PA 600k because I couldn't eat. Only made it 180 miles. I was pretty sure that I wasn't going to be able to ride 90 miles of mostly uphill on no food. Well, I could have, but the last 110 miles was pretty brutal.
It somehow had escaped me that the NJ 600 registration was even open, and they are overfull. I'm on the waiting list, but I think I will go ride the much more difficult looking DC 600k. Going to have to work on my heat tolerance. I DNF'd this DC course last year because, wait for it, I couldn't eat. Well, I couldn't drink either. I really like the part of it I rode though.