O2 sensor is not going to be silver bullet you think here. BTW, I have a 89 4x4 burb with over 180K mile (that I bought new) and I have NEVER changed O2 sensor on it and it is getting some of the best MPG of its life now and will do 18 MPG on road all day long. Might change it for grins one day but it does run great now and I am afraid to mess with it.  

never said it was the silver bullet. don't care about your suburban on a dodge forum. does no good to compare a suburban to a w250. you sound like every one that comes into my dads shop. don't wanna fix some thing that you think is not broke. its called preventative maintence  

1978k-20:
never said it was the silver bullet. don't care about your suburban on a dodge forum. does no good to compare a suburban to a w250. you sound like every one that comes into my dads shop. don't wanna fix some thing that you think is not broke. its called preventative maintence

No you do, the point is that O2 sensor is not a silver bullet and Dodges of that era are not known for good MPG and do not get his hopes up.  

your the one trying to get his hopes up with your gss mile age of the suburban. never said the o2s were gonna be the silver bullet you did  

No I was not as I said Dodge of the era are know to be thirsty. It was because of low compression and retarded spark timing to tolerate 87 octane fuel which lead to lower MPG. GM used more aggressive timing because they had active knock control to limit consumer complaints on low octane fuel, dodge did not so timing was retard all the time to prevent it from knocking which again hurts MPG. Dodge was kinda slow figuring this out and a lot of their vehicles suffered from it for many years.