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I don't understand, what 0.600 reading? I only attempt DFCO in situations where I can coast for a substantial stretch, like 10 seconds or more. I use it for free engine cooling and battery charging. Under DFCO, I'll turn the alt on and blast the cabin fan. The O2 is helping to reveal the conditions under which the ecu will set-up DFCO more easily and quickly so that all, or nearly all, of those seconds are actually true DFCO, instead of just a very lean burn. I would guess 0.600 would be about stoich, no?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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