My Protege 2000 LX 1.8 is burning to much fuel. I can only get 250 miles on one tank of gas.
I changed my EGR a year and a half ago. I have a K&N air filter that I clean regulary. I just change my Upstream oxygen sensor. What could it be?

 

could just be running too rich in general. get it checked out to see what kind of fuel maps it is pulling right now. if it is running too rich, it will lose a lot of power and burn more gas.