I usually park at millwood and head north from there. I've never ridden further north than Lake Carmel. The trail is mostly a gradual up hill. Taking it south would be easier. Best places for refueling would be Yorktown Heights with both a good cafe (The Traiside) right across from the traffic light in town, and a small shopping plaza with deli and supermarket a little past it. The town of Mahopac also is a good bet, but it can be a steep climb back up to the trail from Rt 6 where everything is located.