My fox is running really rich. I just sold the beater and $3+/gal + 10-12mpg is killing me. I tried pulling codes and came up with nothing except "11". Both KOEO and KOER checked out fine. I was really hoping to get a code to help me out. Exhaust fumes are pretty bad considering I have cats. No smoke, but carbon build up is nice and black. Shorties, bassani catted X, bassani catback. I'm going to replace the O2 sensors, clean the MAF, and check for vacuum leaks tomorrow. Anyone have any ideas or have the same symptoms before?