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The automatic may actually do some engine braking on downhills when in cruise control, whereas just coasting down a hill may not do that. And when engine braking the engine stops injecting fuel - free miles!
Not sure if you manually shift into a lower gear when coasting down a hill to keep the same speed or slowing down, but it yielded great results in our "once upon a time" Oldsmobile Cutlass Ciera.
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