If it's any help last year I tracked 7245ft of climbing in the first 60 miles and 3920ft in the last 41 miles, roughly 120ft per mile of climbing per mile before the newcastleton food stop and 95ish feet per mile afterwards. It's all generally hard and this year is meant to be harder and perhaps on a different route – so you know what to expect! Do use the bag drops for food though – I didn't last year and paid for it before the newcastleton stop.
The last big climb is 4 miles long and gains some 800ft in that distance, then it's 4 miles of nearly plain sailing home down the hill. Just keep turning the pedals. . . . Good luck and see you on the start line!
p.s. I really like Sara's style – no messing. Top lady!