I have 125k miles on my truck. (2006 5.4) All the maintenance as far as the plugs, filters, fluids, etc is up to date and it runs great. I also get about 20 mpg.

The only item I've never touched is the O2 sensors. Being that my mileage is good and it runs smooth should I leave them alone? I've seen guys run their trucks forever on the factory O2 sensors. I've also always heard not to touch them unless your MPGs drop. BBut then I see people say you should change them every 75-100k miles

Thoughts?

 

If you are getting 20 mpg, leave them alone. If it ain't broke, don't fix it.

 

Yep, leave them alone.. Their magical.

 

Is 20 mpg the norm on 06s with 5.4s?

 

and dont do like me and only change the back 2 cuz theyre easier and your to lazy to do the front 2!!!

 

I think 15 is more like the norm - which is why I say leave them alone!

 

if they are still working there is no reason to change them.

 

No, I just commute on country roads 55-65 mph, right in the sweet spot where you can get good MPGs. I use a really light foot too, never over 2k rpms when accelerating. When I was driving in the city everyday I got 17-18.