Hmmm. I think I need to clarify my thinking a bit. Here's my own weekly running schedule that I used for about three months. Same schedule, every week. I ran a 4:10 mile time trial on this schedule. Now, of course this was several months after my first terrible college cross country season when I was injured, but I guess I had a pretty good base to work with, but you'll notice how easy my easy days were, and how quality my quality days were. And yet the overall mileage was quite low with a maximum of 43 miles. This is what I mean when I'm talking about running less to run faster. Like a weight lifter--hard days, followed by really easy or nothing. And it worked. I want your thoughts.
Monday: 10-mile mountain run, with 6-8 long hill repeats.
Tuesday: 3-4 miles easy on dirt roads.
Wednesday: 4-5 miles total, including a one-mile or two- mile time trial.
Thursday: 4-5 miles, with 10 X 100 meter leg speed drills, at 98% effort, with good recovery.
Friday: 3-4 miles easy on dirt roads.
Saturday: 8-10 miles total on rolling hills and dirt roads, including 3-5 high quality miles in the middle.
Sunday: Total rest and light stretching.