Hey All, so I'm a bit new here but I'm having a serious problem with my Focus. I drive a 2005 Ford Focus zx4 ses, great solid car BUT, my gas mileage is very awful. On a full tank of gas, I get on average about 12 mpg city and almost 16 mpg highway. I have 122,400 miles on the car which I know is kinda high, but this car is like my baby I love it. I bought it brand new in 2004 when it was first released. The maintenence is perfectly up to date. I have a custom cold air intake on the car, that I keep nice and shiny and new. I can't quite figure out what the problem might be. Anyone have any ideas?