As the title states, I'm getting really bad MPGs....I filled up today, calculated the MPGs- came out to 11.4. That's horrible, granted it's a 4x4, but it shouldn't be THAT low. So my question is could my o2 sensors be a factor playing in? I'm pretty sure that they are old- not throwing any codes, but would it be worth it to go ahead and replace them? I have about 250 pounds of gravel in the bed for winter traction..but it should have that much of an effect. Anything else I should look at?

 

Well, I filled up last night-12.1 MPG. I've had enough, I've ordered new o2 sensors. Should be here Thursday (12/20). Will update once I have them installed and a few fillups later.

 

What was your mpg before you noticed it being that low? I know the cold weather makes the mpgs go down, but I've never noticed a dramatic change, maybe a couple of mpgs less, but that's it.

 

Your right foot has the greatest impact on MPG.

 

After I got the thing back on the road, I was getting like 16-17.5 in the summer. I know that cold weather doesn't help either. I don't hotrod my truck either. Going from 16.5 to 12 is quite drastic. I've had a feeling that they've been bad for a while, like never been replaced.

 

Well,

^%$^%$&*^!^%*$#$#@%##$%&*&^)*&_(!!!!!!!!!

Just took out the drivers side o2 sensor-had to use a mapp torch to heat it up enough to get the thing to turn. Anywhos, on it's way out it stripped the outer threads on the hole. I have purchased a thread chaser, but cannot get it to work. So, now I have a huge honking hole in the pipe until my mechanics shop opens back up in January. Any ideas on how to fix this problem? Besides buying a new cat.....

 

UPDATE: Pulling 16MPG again! Filled up at 111miles with 6.9 gallons, comes out to like 16.1mpg.

Just took a couple tanks for the ECU to recalibrate...

 

How often do o2 sensors need to be replaced?

 

I have heard that they wear/start becoming inefficient about the same time as spark plugs, so I'd say somewhere in the every 75-150k mile range. Mine were well above that range....