How much does increasing mileage actually increase fitness?
Say someone runs a 26:20 8k off of 50 miles a week (or any race off of any number of mpw for that matter), how much of a benefit is increasing mileage to say 75, or even 100 miles a week, considering it is done properly and doesn't lead to injury etc. I understand fitness also comes from workouts/long runs, and sleep, diet, and other supplementary training also affects performance but I was wondering specifically about base mileage.
Bump
As you mentioned, there's no formula that fits everyone. Hell, there may not even be a general trend. Check out the thread that asks people how many mpw they are running and their race times. It's not exactly what you're looking for, but it's trying to establish a trend that correlates mpw to race times, which is what you are seeking.
How much benefit increasing from 50 to 75-100 miles?
Plenty.
If you're looking for greater precision: it depends, and varies.
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