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Well, that's a 12% difference in compression between #3 and #4, which is quite close to the 15% max., and I wonder if the lean burn function is more sensitive to lowered compression. Did you do a wet test too?
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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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