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Hills make P&G easier and more practical, so P&G on hills outperforms DWL on flat land. But if you're not going to engine-off coast down the hills, hills are bad. They're also bad when you need to accelerate up one.
Wind is bad 3/4 of the time. Overall, hills and valleys reduce ground-level wind, which is good.
Bottom line, depending on your hardware and your technique, you may be able to use terrain to your advantage. Not me, though: my car has excellent gearing and lean burn for flat land cruising, where I outperform hills by 10-20mpg.
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