Well the reason I said what I said is because if you read this article:
http://asia.vtec.net/spfeature/vtecimpl/vtec1.html
The author will talk about the 3 stage vtec mechanism and says stage 1 is "Below 2500rpm and with gentle accelerator pressure, neither pin gets actuated. The engine operates in 12V mode with very good fuel combustion efficiency" (which is basically vtec-e with no actuation of vtec).
Then he goes on to say "Stage-1 12V or "lean-burn" operation mode is indicated to the driver by an LED on the dashboard. The 2500rpm cutover from lean-burn to normal 16V operation in fact varies according to load and driver requirements. With gentle driving, lean-burn can operate up to 3000rpm or higher"
I'm not sure if this technology was applied to the earlier 92-95 civics but it seems like lean burn mode on those engines was simply an indicator of whether it was in the first "vtec" stage or not.
jadziasman 
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