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My experience with lean burn is not exactly the same as you fellas, but I feel compelled to chime in.
I just put a simple voltage divider on my MAF, and used a LM-1 wideband to monitor AFR. When I do this the motor believes it is at a lower than actual load and the ignition timing is advanced to it's maximum available, 40 degrees. I typically run around 17:1 AFR, but because it is a voltage divider, the AFR varies by load...ie. High Load=Leaner, Low Load=Richer. It works pretty well, but the PCM grows wise to my tom-foolery and kicks into limp/open loop after just a few miles. However it is easy to reset it back by using DFCO. This compromise method returns a benefit of approximatly 2-3mpg. I only engage this lean burn under light load cruising, but have found it is still able to pull up hills just fine. I have been considering using the LM-1 to set an offset, so I can keep the motor at 17:1 and switch between the standard O2 sensor and the LM-1 that is offset for cruising, however I would loose my ignition advance because the PCM would not know it was lean, the normal ignition advance is 32-34 degrees while curising.
Just throwing some thoughts out there...
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