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I watch the Loop gauge on the Scangauge. It goes to Open Loop when it's in DFCO mode. There's no need to monitor the exhaust O2 levels if you're not injecting any fuel, right?
On both my Hondas, it holds DFCO down to about 1200 rpm, then fires the injectors back up. My civic is a manual, but the 04 Odyssey is an automatic. As long as I downshift to keep the rpm above 1200, I get DFCO.
That said, it's almost always more efficient to idle the engine and coast in neutral - momentum is more valuable than the light fuel usage.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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