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I have a ScanGauge II in my '01 Saturn. And I can tell you that invoking DFCO takes some work. I don't know the exact parameters. But it takes more than 1500 RPM to trigger it. Plus there is a time delay, several seconds long. Like I said, I don't know the specifics. But I've only seen "9999" on the instant mpg display a few times, all of which were on long down-dill coasts.
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