On my route, I took Hwy 50 west through Gunnison to see a friend, and the on to Montrose. From there, I headed south on 550 over the "Million Dollar Highway" and three 10,000+ foot passes. These are the extra climbs that I sought out. 550 dropped me off in Durango, and I headed south west out of Durango on 160, Wildcat Canyon, and 140. Hwy 140 turns into 170 in New Mexico and I followed it to Farmington. I took 64 west out of Durango, through Shiprock, and into the Navajo Nation and Arizona. Just inside on Arizona, I joined up with 160 and continued west through Kayenta and Tuba City. Instead of heading south down 89 to Flagstaff, I detoured to the Grand Canyon and headed south to Williams before picking up Route 66.
On my route, there were no towns between Shiprock and Kayenta, and again between Kayenta and Tuba City. Both of those distances are about 100 miles. Like I said before, there are service stations about every 30 miles, but not much else. My ride was very hot and mentally taxing. There was nothing on the horizon except an unendless series of mesas that you must climb and descend. If I was to do it again, I would strongly consider heading south earlier and avoiding the 4 Corners region completely.