I am trying to chase down the root of my bad gas mileage and I'm thiking it maybe the 02 sensor. I remember seing a page explaining how to use the single wire(or is it two wires?) o2 sensor with a simple modification and that it works as good or better then the normal 3 wire sensor. My questions are, has anyone used this with good results and does anyone know the url for this page? And which o2 sensor should I purchase, I mean is this single wire one for a different model or year? Thanks for the help!