I sequenced my own way to avoid dirt roads as much as possible... flying 70 mph on blacktop is better than 30 mph or less on dirt roads.
Better to drive 15 miles on dirt roads than doubling back and driving 50 miles. I literally had a forest service road that went over a range of hills, through the forest that I discovered that saved an hour or more if delivering to homes out the paved roads. I had many areas with logging roads that criss-crossed the hills but were on no maps. Saw many bears, elk, cougars, coyotes, etc. along one 25 mile stretch of dirt roads. If stops lined up right (or wrong) knowing those roads were all that made it possible to finish and get home in time to get 7 hours of sleep before starting again. I learned rather qickly to cover the remote stuff while there was still some daylight, leaving the in town stuff if necessary until after dark, sometimes during peak until after midnight.