So, would this mess with my mpg? My cars running rich. STATS: 2006 nissan 350z 6sp. 42k. Obx headers, megan racing hfc, megan racing y pipe, topspeed pro n1 3" dual catback exhaust, jdm catch can and jwt popcharger.

Possible issue:

O2s11 (v) 0.295 : bank 1 sensor 1
O2s12 (v) 0.78 : bank 2 sensor 1
O2s21 (v) 0.61 : bank 1 sensor 2
O2s22 (v) 0.81

 

Sorry, last one is bank 2 sensor 2.

Is the bank 1 sensor 1's lower voltage normal? Could this be my rich issue?

 

After some light research I found sensor 1 bank 1 if below 0.3 means kicking lean code...but others are rich...hmm.