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Well, a 6% downgrade is pretty severe. The nearest one of those to me is a good 1000 miles away!
You also have to balance out the lost momentum from regen against the power reclaimed. On the much more common flat-ish land, coasting comes out ahead for this very reason. You do use a little fuel idling the engine, but it's more than counteracted by the momentum not lost to engine braking.
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- - - - -Best 8-mile commute: 74.8 mpg
- - - - -Best tank: 66.6 mpg / 730 miles
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