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I asked about DFCO on SubaruForester.org and still have not received any responses, but there were mentions of the RPMs needing to be above 1800\at 1900, which is pretty heavy engine braking. They said that fuel gauges did not recognize DFCO and since they do not recognize lean burn, that makes sense.
As long as the engine is moving, it is drawing in air, right, which is all that is communicated via OBD-II, not fuel consumption?
The guy that said that fuel gauges did not show DFCO said to watch the temperature, it will go down, but except for big hills, I cannot imagine this ever happening, and it seems that when users notice it working, it only does a partial job.
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