92k through Germany w. El Prez + nuther club chum. Suspect I went into the red in the cold on 1st climb because on 2nd climb El P was away ahead and it's usually v.v. Didn't have much to eat beforehand, nor yet night before, so was low on reserves. We were planning on 120+ but I felt so grim despite almond bars & so forth I decided to pack before halfway, so we all had lunch in a handy wayside tavern, and thereafter we all turned back together. I felt fine, but I reckon I'd have carked it on a good long climb. Anyway, we took a less lumpy way home, which was stunningly beautiful in the sunshine. Thermometer went up into the teens after lunch but the wind was vile so we were cold until an hour before the end.