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LISTEN CLOSELY
Lean burn does not put it in 12V!!!!!! It starts in 12V with normal operation and 14.7:1 AFR,... the ecu looks for the proper temp, the proper engine load,.. the proper RPM,... and a few other little odds and ends and then it decided everything is good to enter lean burn at which time it will ONLY and I repeat ONLY change from 14.7:1 AFR to 22:1 maybe even 26:1 AFR,... that is it. That is all lean burn does, that is all the ecu will do. When you step on the pedal more,.. increasing the engine load, it will kick you back down to 14.7:1 taking you off lean burn. All the above can and more than likely will be done while in 12V mode and never entering 16V mode.
If you really really want to learn for yourself, do tests and experiments to satisfy yourself. Follow the fuelly thread you posted and install a vtec light. By installing a light it will eliminate all doubt from your head and you will realize what it is that you are feeling,... if lean burn mode OR vtec engagement/disengagement. Better yet after you install the vtec light install an O2 sensor gauge and when it stays all the way on lean for a few seconds, more than likely you are in lean burn mode. Again, the 2 don't happen at the same time. Stop relying on shift light,... its a shift light, not a lean burn indicator, not a vtec indicator,... just a shift light.
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