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Old 08-10-2010, 04:05 PM   #4 (permalink)
Left Lane Ecodriver
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Join Date: Aug 2008
Location: Buffalo, NY, USA
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Prius C - '12 Toyota Prius C
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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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