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I came across a DIY which addressed this issue. What it had, basically was a couple of op-aps set up so that when the sensor voltage got to 0.20, the output would toggle to deliver the .08 to the ecu.
From what I've read, a regular Oxygen sensor is functionally not linear when it is crossing over, it's almost more of a switch that toggles at "about" a stoic mix, but it's not calibrated, so instead of trying to read a actual value, they just keep adjusting the mix, so that it is constantly going up and down, criss crossing through stoic.
I don't think their is any reason not to do this. I don't know how much leaner it's going to go, than stock, because, my understanding is the switch point is like14:1 or 15:1, somewhere in that range. The 5 wire sensor, like is used on the HF and VX go up to somewhere in the range of 25:1, from what I've read, so even if you got the switching range tightened up, to the leaner side of the window, I don't know how much of a change we'd get.
On the other hand, with the mileage some of people are getting, it could make a bigger difference, in mileage, than it would for the average driver, on the highway.
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zpiloto 
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