That's right folks. I knew a guy who ran 7:59 (3000), 13:48 (5000), 28:39 (10.000) and 2:16 (marathon), and his training usually only averaged 50-60 miles a week (once a day). Bob was also a 48 minute 10 mile runner.
The name of the athlete was Bob Holt, and he ran his best times in the late 1960's and early 70's when running for "Hercules Wimbledon" Athletic club, in Wimbledon, England.
People find it hard to believe that you could run those kinds of times with such low mileage, but the point was that most of the mileage run contained some quality.
An example of a "typical week" for Bob Holt in the mid. 70's.
Monday - 10 miles with a large group of athletes from Lauriston Cottage, Wimbledon. The run was on the roads. The first mile or two would be steady (about 7 minutes a mile), but from then on, the pace would get faster and faster until the front runners in the group (Holt, Gevers, Roberts, Richardson, North) would be running the last few miles in around 5 minutes pace or close to it.
Tuesday - Jog down to the playing fields at Putney Vale (about 15 minutes jog). Then do repeat "efforts" on the grass, such as 12 times one minute, or 8 times 2 minutes. The athletes would then jog back to the clubhouse. Total - about 8 miles including warm up and cool down.
Wednesday - Steady 7-8 mile run. Usually around 6:30 mile pace.
Thursday - Similar to Tuesday. Or a hill session on the road, with repeats up a steep hill several times. About 7-8 miles in total.
Friday - 5 miles steady, or rest. Pace about 6:20-6:40 per mile.
Saturday - race or fartlek session. Total 8 miles.
Sunday - 10 miles steady in large group.
The only time Bob increased his mileage was for about 6 weeks before the Harlow Marathon (1975) when he added 3-4 five mile runs before work. He then did his debut Marathon in 2:16. After this he went back to his normal schedule of around 60 miles a week.
Bob worked a full day in an office in Central London, and would come to the club house at 6pm sharp most days of the week, dressed like the true British Gentleman, which he was.
On Thursdays Bob's training group would all retire to the "Dog and Fox" for a slap up meal, post training.
Posting fast times is not all about talent, but also about efficiency and doing the right kinds of miles, but not overdoing it.