Once the ultragauge shows DFCO as 0.000 volts on the primary O2 sensor, the reading will stay zeroed-out in second gear until the car hits idle speed and needs gasoline to keep from stalling.
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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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