What are the benefits of increasing mileage?

I have read a lot of posts here, and a many say they improve a lot, and some not so much. Also if you are on the slower side with slowtwitch fibers you benefit more than a natural fast runner, the latter respond better to fast/ hard workouts with less mileage.

What are the benefits? Off the top of my head I'd say faster race times, less time spent around your wife.

I'd be willing to bet you could crack sub 16 after a few months of 70-80 MPW.

Everyone responds differently, but I do better when I run off high mileage.

I just did a training week of 120 miles and 25,000ft of vert and legs still somehow feel fresh enough that I was able to pull off a sub 5 mile yesterday at the end of an easy run.

Everyone is different for sure, but it really works well for me. I wouldn't be half the runner I am now without going high mileage

makes ur heart pump more volume per beat over time...allowing you to push more power and lowers heart rate for a higher max

everyone reacts differently to stimulus. Some are strong responders to more miles...others not so much. Some need speed and high intensity rather than just more miles.

I once saw it described on the boards as “if layout fitness is a bucket, and workouts are water that fills it up, running higher milage slowly increases the size of your bucket” it helps increase your aerobic consort allowing for more/harder workouts.

It’s different for everyone though. Not everyone responds well to it. And it usually takes about 3-6 months before you truly can tell if it’s having an effect.