Maybe another method of training might help you to improve? I think everyone's body is different and our bodies go through different cycles. It's hard to keep poistive when you don't see improvement. I'd been feeling pretty discouraged lately about distance. Last week I went on a ride and was absolutely pooped after only 10 miles. There is a road block of a sort to my rides and those are the hills in SF. To get back home I have to climb the entire way. Any ride from my house is all downhill to start. A few weeks earlier I did 24 in the city and felt pretty energized...but ever since then I just haven't felt quite up to par.

Maybe you've reached a mini plateau, but you could start seeing results sometime soon? Just hang in there. It's easy to look at other's speeds and wish we could achieve that. My avg is only just over 10 mph! I read about you guys and wonder what's up with me!