+1 I didn't want to blather on forever, but the breathing was another breakthrough made possible by the meter.
I started doing yoga after my two back surgeries, (and yoga is really big on deep, relaxed, focused breathing) and I noticed when I employed that deep, yoga breathing while riding, I was able to sustain the same output at a lower HR.
For years, I just let the body take care of its own breathing, but I'm convinced now that making a conscious effort at keeping your trunk relaxed and breathing deeply has a terrific benefit. And it's tricky because it is possible to concentrate on breathing too much and clench up, but the watts/hr ratio is a good indicator when you're doing something wrong like this.
I'm still working on staying relaxed during events and in when putting on the hurt. It takes a lot of focus to NOT let your trunk clench up in those situations.
I don't even race, but the challenge is pretty exhilarating sometimes.