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The lean burn threshold in my 2000 Insight was noticeable because the pedal response got noticeably duller even with small adjustments. Also, the car made an almost imperceptible stumble when it transitioned between lean burn & regular. But I think other Insights didn't stumble.
Gauge: you'll want an MPGuino, because it'll properly show your fuel consumption vs. a ScanGauge or Ultragauge (which will not properly report lean burn consumption -- they always assume a 14.7:1 ratio). Do some seaqrching here for more info.
Oh, and also: congrats on the HX, and welcome to the forum!
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