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Deceleration Fuel Cutoff (DFCO) (originally implemented for emissions, not mileage)
I just heard of this, so learning that it was implemented fifteen years ago is slightly embarrassing. I read a few times that it has pretty much been on all vehicles since OB II came out in 1996. Some guy wrote that he thought that DFCO was required by OB II, so I looked into it, and found:
Therefore Deceleration fuel cconditions cutoff (DFCO) is sued to utoff control catalyst temperature during vehicle coastdown, when the engine intake manifold pressure is drive too low to a, allow llow complete combustion. To prevent unburned fuel from entering the converter, the fuel injectors are shut off by the engine controller.
So, DFCO was implemented for emissions, not mileage?
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