I am trying to get a handle on where my gas mileage should be. I am currently getting 20 mpg (not good). I need a reference point to know when I have corrected the problem. Just replace O2 sensor, and am going to replace throttle position switches too. What is everyone else getting? city mpg? highway mpg? Best|Regards Brett|M.|Clapham San|Diego|State|University Methods|of|Geographical|Analysis