Hello brains trust. I have a 91 3fe.Car drives and idles perfect. Fuel economy is yuck and get 220kms a tank on 33x12.5s and it's auto, driving me insane to the point I want to burn it.i have no gear at all weighing it down it's just stock. I did the paperclip and ran diagnostics and came back with a code 12. I don't own a fsm so could someone help me diagnose what the code is for and if it could be affecting my fuel economy. Thanks in advance. I've replaced for fuel pump and filter recently. And I did find the fpd screw out which I screwed in.