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Ultragauge DFCO observations
I have had erratic results from tanks in which I used DFCO extensively, so I reset my displays to allow me to observe both the instant FE reading and the primary O2 sensor. The FE readings are, of course, a calculation by the UG, while the Primary O2 reading is the voltage coming from a dedicated sensor. The sensor reading would have to be a better indicator of DFCO than the UG calculation.
Results: the UG will read 999.99 mpg almost anytime you have it in gear and release the throttle but the O2 sensor often will still indicate fuel being burned. This is sometimes quite a lot of fuel, it would seem. In third gear descending a hill for 10 seconds with a thoroughly warmed engine, the UG showed 999.99 instant MPG while the O2 readings was .6 volts, slowly sliding down to 0.135 volts and then 0.015 volts. Very lean... but not "cut off" ...
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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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