When you go south from Flagstaff it warns you of eighteen miles of downhill grades, but there are definitely uphill portions. I usually downshift to stay around the speed limit, but once I get closer to the bottom, I often cost in neutral. The uphill portion bleeds off my excess speed and requires me to start accelerating again.
When I drive from Phoenix to Show Low people always pass me going uphill, so I felt surprised they drove differently south of Flagstaff.
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