Went on my longest test ride so far, with loaded panniers today about 26 miles on the hilliest road near me (in Florida... land of flat). On my road bike not loaded with anything I'm good for 45-50 miles no problem. But I really really noticed the weight going up some of the hills today. I actually need to learn/practice going slower and pacing myself. I keep wanting to ride faster than I should for a long ride all loaded up. I'm NOT a fast rider by ANY means.... But I'm just used to my un-loaded pace I guess.
Still having fun, still dunno what I'm doing.... getting ready for my first tour this fall.....