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Yeah sure.
your engine burns 14.7 grams of air for every gram of gas, usually.
Lean burn just steps in and tells the injectors to only squirt a gram of gas for say 16 grams of air. The idea is you get to burn the extra air for free, while using the same amount of fuel. The advantage is you get a little more fuel into the cylinder(by fuel I mean oxygen and gasoline combined) that you don't pay for.
The HF kicks into lean burn mode under certain circumstances. There is a lean burn guide around here somewhere for the HF but I don't have it stickyed.
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