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Since you are new, you may be interested in the interactive encyclopedia at this site:
http://www.insightcentral.net/encyclopedia/index.html

as well as the knowledge base:
http://www.insightcentral.net/KB/index.html

"lean burn" refers to the air-fuel ratio of as much as 22:1 that the 5spd Insight can use. Most cars run at about 15:1. Lean burn is what allows the 5spd to cruise while consuming very little gas, even on the highway.
http://www.insightcentral.net/encyclope ... ngine.html

Lean burn results in higher NOx emissions, so the Insight has a special catalytic converter to deal with them:
http://www.insightcentral.net/encyclope ... lytic.html

and the catalytic converter will work by doing occasional rich-burn "purges" which you will see as increased fuel consumption on the MPG display and feel as a slight boost in power:
http://www.insightcentral.net/KB/faq-no ... ngineSurge

Hope this helps!
EDIT - Note that the CVT Insight does not use lean-burn, so most of what I said above is only applicable to the 5spd. However you may still find the first two links useful in general.
 
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