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Thanks for this discussion. I like the turn this thread took a long time ago toward figuring out balances between emissions and fuel economy that might plausibly reflect total gains in eco-friendly operation. I took a couple ideas from here: going back to exclusive engine-on P&G on the freeway to help keep the cat "lit" and only using DFCO (with the engine off) at the start of a trip (when the engine is still cold anyway) or near the end (when I am about to shut down anyway). I'm also starting to study the O2 sensors and their relationship to rich/lean fuel trim conditions. What an excellent intervention this thread has turned out to be.
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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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