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Since you are new, you may be interested in the interactive encyclopedia at this site:

as well as the knowledge base:

"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. ... ngine.html

Lean burn results in higher NOx emissions, so the Insight has a special catalytic converter to deal with them: ... 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: ... 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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