The thing is the rest of us are not BK. BK could have won his HS conference running a mile a day in gym class. Do we really know BK ran under 35 mpw in HS?
Did BK run Badger miles? 34.9 x 7 min is 40.7 at 6 min pace. Did BK run 34.9 Badger mpw averaged over 52 weeks per year and take 8 weeks per year off? Most would call that 48 mpw. My guess is he really did run 34 mpw but I doubt he took many weeks off.
The point of the mileage, mileage, mileage comment is not that you have to run 100 mpw in HS. The point is that at most schools you have to do a little more than the coach's practices in order to be successful.