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Not sure if you're actually asking, but here's my take...Theoretically, yes, driving in the hills should be more economical. Your engine will be(can be) running in its more efficient zone going up hill...and you can coast down. Its basically pulse and glide, only rather than picking up speed, you're picking up potential(gravitational) energy.
On the other hand, if your vehicle is particularly heavy, you'd be using a lot more power to climb the hill, and might pick up too much speed and have to brake(a pure waste of energy) on the downhill side. You might even push your engine past it's efficient zone getting up the hill in the first place.
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