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I read through the thread and didn't notice any mention of the O2 sensor.
There are some myths (IMHO) about these sensors and when they go bad.
First of all, they don't always throw a CEL, and secondly, just because they still respond, doesn't mean that the response is fast enough to provide high MPG.
I have replaced the O2 sensor on my Tacoma twice, both times because engine work was done (contamination in the exhaust stream), and neither time did the light come on.
But in both cases, my gas mileage went down by about 25%, something to consider.
Chipsndukes
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