You know the grade; go on a treadmill and get used to that grade!!! Get used to run for a "long" time on the grade (and YES I KNOW ITS BORING!!!) but you will be grateful for it on raceday!
I've since learned that the 1999 women's winner (living in NYC) trained on a treadmill at 11.5% grade after finishing 3rd the year before.
Mt Washington! I had no idea there was a race there, I tjought it was all just weather stations and Marty Engstrom.