Joined: Aug 2010
Posts: 12,760
Likes: 2,117
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
I occasionally just run out of fuel at the end of a long day, not dehydration related. I generally have suspected that blood sugar or electrolyte levels are too low. Usually when this happens I felt like I had a lot of energy an hour before I ran out of fuel which adds to the confusion.