Mine dropped to 24 MPG in my auto 98 lx, it was cause of the O2 sensor. However, I had a CEL to tell me that.

I also changed to air filter to a K&N, that might have helped a little, I just got 29 MPG with all city/hills driving.

 

Try checking the oil also...

 

i was gunna say to change ur oil cause my mileage drops when its time to change or even just 1qt low.

 

if you change thefuel filter make sure you take off the three bolts mounting it to the engine bay first, as well as the "Band, fuel strainer" pic #5 and #6. I had a heck of a job getting the feedline in after putting in the new filter because I didn't do this. Also put the feedline inside the filter befor snaping it back in it's slot/Band #5. Or it will be at an angle and bind up. It'll make more sense once you scope it out.

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If you need more help with the fuel filter hit me up becuase I just did this recently.