I can't quite figure out what's going on. This year I made a much more concentrated effort to ride the trainer over the winter months (At least 5 hours per week), which is something I avoided in years past. I've got about twice the road miles in for the calendar year over the last three years, all of them using a heart rate monitor and staying at the planned level. (I always ride at least 1500 base miles with heart rate not exceeding 80% and usually around 65 to 75%, afterwhich I then start to push into 90% for intervals and other more strenous training.) My resting heart rate and recovery rate is actually better than it's been at this time over the last 3 years, and my weight is down by 20 pounds. Despite all of this, my average speeds on routes that I use to guage fitness are down 1 to 1.5 MPH. I've not changed my equipment in any way, and am worried that getting another year older is taking it's toll. I'd like to tell myself that there's been more headwinds this spring, but don't really think that's the case. Any insights into what may be going on would be most appreciated.