Nice work! On your question.... I also think there are too many uncontrolled variables in your test, BUT there is no way to A-B-A test such a mod AND the data you have is suggestive of what we might expect, so keep tracking your fuel economy. If it's working nicely you should usually see better FE in similar driving conditions. Keep a fuel log here at EM so we can see your progress.
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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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