5600 ft over 78 miles, 74 ft of elevation per mile. Or 2600 ft over 25 miles, 104 ft of elevation per mile...Though if you think about it only half the distance is climbing, the other half is descending...Thus 5600 ft over (78 divided by 2) 39 miles, 143.5 ft of elevation per mile and 2600 ft over (25 divided by 2) 12.5 miles, 208 ft of elevation per mile