I have heard that the Super Tunnel Marathon course is worth about 10+ minutes and now I believe it.
This course has a net elevation loss of 2,000' but it's rarely enough that you feel like you are actually running downhill, it just feels like you are having a good day. Which is exactly what I had today.
I rarely run road marathons with the intention of posting a fast time for myself. First of all I mostly spend my time on trails and when I do enter an official road marathon more often than not it's to run with my sister or a friend. About two weeks ago, on a whim in other words, I figured why not give running a marathon for myself a go. And since this event was two weeks prior to the next big race on my calendar it seemed like a perfect last hard workout before my taper.
With no speed or event-specific training I blew away my best case expectations. I am finally starting to feel like I'm back after all my injuries and surgeries. And believe you me, it feels good.