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It would seem that you are typically going to be staying in lower gears while pulsing/burning up a hill where you can quickly gain speed and get into higher gears while pulsing down a hill.
It is my contention that the car is more efficient gaining speed in a higher gear while going down hill thus storing inertia for the coming hill climb.
Here on the big island we will drive from Hilo to Kailua-Kona over Saddle road but in that case you have to just get up that mountain getting poor mileage but then you get to coast for miles and mile on the other side.
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