Maybe it is more accurate to say "fuel trim"? The UG displays a fuel trim figure based on readings from the O2 sensor. It displays as, for example, -10.9, and the manual says to read that as a percentage change from 14.7:1
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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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