I've been running for about 10 years at a variety of distances. Have I run a good race? Yes, I have run a good race. Have I run an excellent race? Yes, I have done that.
There are a few factors that lead one's running from the excellent to the profound. The BETTER approach is: techique + quality = impact. You can't have quality workouts without good technique, and you can't have good technique unless the repitition is confirmed through quality workouts. Only those two things together will create impact, and it is within the CONTEXT of those things that you see the improvement in performance.
Case in point: I did high miles for about 4 years (90-120 mpw avg.) I would wake in the morning after having done about 4 miles, get up, shower, do another 14, 15 miles in the evening in the context of a quality workout. I would wait the entire day for the workout, only to have barely enough time to fit it in, and often having to miss it entirely, leaving out a large portion of the weekly mileage -- bringing the overall effectiveness of the mileage much lower (goal mileage 90 lowered to somewhere in the 60s).
QUALITY is much, much more important than quantity.