So my car started getting complete crap for mileage, and the check engine light came on. Pulled an o2 sensor code, so I replaced both oxygen sensors ($98/ea) and I'm still getting 14mpg, and developed an EGR code
I know we have sh*t gas out here (damn ethanol) but any common problem areas I could check as to what would be killing my economy? I'm currently driving my truck cuz it gets roughly the same mileage and diesel is currently cheaper than premium...