Allright I know that everybody has good days and bad days, but totally confused as to how one day I could be so much stronger than the next. I've tried to monitor what I ate the night before when I get in this zone, but can't figure out what might be different. Yesturday I got up at 6:00 am and took off on one of my Saturday mourning rides. I didn't eat a thing, but I took one gel pack with me to consume about half way. I was shooting for 40 miles and actually did about 37. There were a couple of stiff 15% grades along with the usual rolling terrain that I encounter on any route right by the house. Most days I can climb the steep grades, but I get quite winded. Yesturday was one of those days where I seemed to go up the climbs with a lot less effort. The hardest climb I encounter is the one coming back into the nieghborhood. It is a good test of how much I've got left at the end of any ride that starts at my house. I can usually stand up and take it slow and make it without zig zagging. Some days I have to zig zag the whole way up, but yesturday even after 35+ miles I just rode right up without any trouble. I felt as though I could of rode another 30 miles. It's almost like it's a blood sugar thing. I do have a touch of high blood pressure, but I don't take anything for it. I'm hyper person anyway. I will get this feeling on longer rides sometimes at the 40 mile mark where my breathing suddenly gets more relaxed and my energy level is actually higher than it was at 10 miles. It's almost like I doped (not that I would know what that feels like). It would be nice if I could find a way to get in this zone more often.