Analyze this:
VERMONT-PHILLY 2021 ACTUAL - A bike ride in Saint Albans, VT (ridewithgps.com)
Nor included is the day riding I did in and around Burlington, VT and Hyde Park, NY, nor mileage inside campgrounds. Odometer, which was at 0 when I left the house to ride to the train station, and which was spot on accurate according to road mile markers, read 650.
While 49'/mile is what I would call moderately hilly, the healthy number of trail miles incorporated into the route makes that number misleading. That's why I believe you have to look "through" the numbers.