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I've driven in hills extensively living in WV. The really steep mountains are an issue, but the rolling hills I almost always get better mileage as I can essentially "Pulse and Glide" using gravity instead of my speed. Some of the better coasts through western Maryland (Cumberland Area) and PA can last several miles.
When the hill gets too steep however, I have to eventually drop to 3rd to climb it (or at the very least, the torque converter will unlock) which drops efficiency. Then going back down it I simply go too fast to stay anything close to the speed limit, and that makes me not coast as long as a result of having to brake or using engine braking to slow my speed.
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