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Lean burn: monitor the "instant" (bar graph) gauge when cruising at, say, 45 mph. You'll see it spike from roughly ~55-65? mpg up to ~75-100 mpg on a level road in warm weather. That's lean burn. You may also be able to "feel" the transition with a very slight engine stumble. Also, throttle response becomes noticeably "duller".
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The first paragraph scared me too much to think about yet!
As far as lean burn, I'd say I've already experienced it, the 75 mpg readout with the stumbling occasionally!