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DFCO only works while the car is in gear at a certain rpm range. I don't completely understand it all, but I do know this much. Once the rpm's get so low then it starts to burn fuel again that is why you benefit from putting the car in nuetral while stopped, because with the car out of gear it's placing less load on the engine. You know there is load on the engine of an automatic stopped in gear, because if you let off the brake the car will slowly take off on it's own, but in nuetral it will just sit there with the brake off.
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