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Old 11-03-2012, 12:52 PM   #6 (permalink)
markweatherill
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With deceleration fuel cut-off (aka engine braking) you have no fuel used but the engine is slowing the car down a lot faster than in engine-on neutral coasting, where you have the engine idling but not slowing the car down.
DFCO will obviously save fuel if you were slowing down anyway.
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