Burning fuel

[tinys s14]

My car is burning alot of fuel. I changed the o2 sensor by the catalystic converter since it was trowin the code about 4 months ago. Its a 95 240sx with a bone stock motor. No engine codes are showin up. i would say Im getting about 12 miles to the gallon. Before I use to get lik 20 to 25.

thanks kev

[BoostedCoupe]

Change the plugs, fuel filter. What grade gas are you running? have you changed your driving style?

[SCato]

Spark Plugs and Wires, Change the first 02 sensor, maybe change fuel filter, air filter, etc

just do a basic tune up like you just bought the car and see if that helps or fixes it