Nice idea but I think the predictions are way off. I ran a 3:17 in spring and targeting a 3:10 marathon in a couple of weeks.

As unlikely as it sounds Strava predicts 3:13 (think they base it on my last marathon), Garmin is similar. Runalyze is about as off as you are.

Maybe you're putting too much emphasis on weekly volume. M35 and I can run this with 50k weekly and 75k peak volume. Relatively confident I'd be able to sub 3 with weekly volume of 80k/100k peak.