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There was a Cali and a federal ECU for the HX. Lean burn was still not allowed in Cali, though I understand the first gen insight had lean burn and was it was available in Cali. The easiest way to determine if you have the Cali or the Fed HX is to look at the upstream O2 sensor. 5 wires = Fed (and lean burn) while 4 wires = Cali (and no lean burn).
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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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