okay I did my post earlier, read all the forms and my 2000 ZX3 2.0 Zetec still averages 20 mpg, not the 25/33 as indicated. I have spent endless time and money trying most of the fixes listed in forums with no change at all. What gets me is that there is now way to troubleshoot this problem. Ford says there is nothing wrong with my car and that their computer says I should be seeing 27 mpg, and they did all city driving. Ford and other users on this post say that it must be the way the car is being driven and/or tire pressure, air filter, and on and on. I say bull crap, the car has a problem and no one knows how to troubleshoot it. What a piece of crap. I dread the day I bought a Ford Focus. Economy car, yeah right. oh yeah and don't tell me you have a car that does about the same and that is the way it is, because I have seen numerous posts where people with the same engine are averaging a lot better gas mileage. What urks me is that Ford has no way to effectively troubleshoot this problem. So I am stuck with a 4 banger that sucks gas like a V-8, what a crock. Sorry for the negative post but I had to vent. Frustrated in Ohio.