intall o2 sensor/ bad gas mileage

[ogparjay]

I have been getting bad gas mileage for awhile now and it seems that I'm not the only one experiencing the 200 to low 300 miles per full tank. I just want to know if anyone tried to replace the o2 sensors already, and if so how do I replace them myself? Thanks for any feedbacks.

fellow maxima driver

[mamasocks]

It could be your knock sensor. Check your ecu codes and then you'll know. The knock sensor wont make your check engine light come on but it will throw a code.

[vinceleto]

I get 230 miles on 3/4 of a tank about 21-22 miles per gallon in mixed city-highway driving. The best I've experienced was about 29 miles per gallon on a long distance all highway 75 MPH average trip. I think thats
average for the max. If someone is getting better please let me know how. Tire pressure is important 32-35 minimum.

[Blackwind 98 SE]

do the ks, also check your fuel filter. i used to get a max of 325 miles per tank. i did that and swicthed to cheveron 92 and now im hitting 400 per tank!!!! thats some crazy stuf.