^^^^^And he doesn't have any cats anymore. I'm sure that's messing with the sensors and overfueling. No matter what vehicle we're talking about, if you set the cruise for a whole tank of highway driving you will ALWAYS get more miles per gallon than a whole tank city driving. Anything else is just flat earth theory. So, if you're truly seeing the exact same mpg on both a whole tank of city and whole tank of hwy, something is definitely not right, either with the your repairs or calculations.

 

The NTK O2 sensor was good when I replaced it, I did it to simply observe impacts on fuel economy, since literally nothing happened in terms of performance or fuel economy, so I am guessing it isn't the problem. If the O2 sensor caused a problem, the fuel milage should have gone down, not stay at 11.4 mpg.

I do appreciate you guy's time. If a different O2 sensor and sparkplugs will give me better mileage than it is worth a shot. I just don't want to buy parts if they aren't the problem. This guy is a steady 11.4 mpg, on the nose, regardless of driving habits or repairs. It is impressive really.

 

If he is going by the overhead console, I think that is average MPG over the life of the truck, or, the last time it was zeroed out. (mine doesn't work, so, not sure.) If I am right, he would have to drive a LONG time to see that number change at all.

I don't trust them anyway. I use miles traveled, and how many gallons I put in at the next fillup and calculate myself. Still, on the 8 liter, the number is depressing.......

 

So are you calculating yourself? Or are those numbers from the overhead console?

I had a chevy blazer like that once. (it was a 77 though.... so, no computers at all.) Didn't matter what I did, how it was loaded, what I was towing, or how I drove. 11 miles per gallon.

 

I calculate mileage by taking the trip meter mileage and dividing it by the amount of fuel it take to the nozzle clicks. I reset the trip meter and fill all the way up every time. I measure fuel economy every fill up of every car. I guess I am crazy about mileage.

 

We tend to call that OCD......... Welcome to the club.

 

My 97 Subaru Outback at least variates on mileage to provide excitement. This guy is a VERY stern 11.4 mpg regardless of fuel grade or ethanol free.

 

Try taking the tuner out and then unhook the battery for a 1/2 hour. I personally would put a NTK O2 sensor in it. Your temperature sensor also affects fuel. After market PCV valves have been found to flow too much air, making them an undetectable vacuum leak. Use a Mopar PCV valve.

 

Would I be good with NGK O2 sensors?

 

NGK is NTK. NGK is spark plugs and NTK is sensors.