MPG Increase

NoMoreJeep

NoMoreJeep

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So I spent the weekend giving my new to me 2003 V8 4wd with 102K miles some much needed TLC. I replaced the timing belt and water pump. Drained and filled the motor, transmission and transfer case and filled with synthetic fluids. Flushed the coolant. Removed a K&N air filter the previous owner had installed and replaced it with a Toyota one. I also cleaned the MAF sensor and removed the HCF from the air box. Lastly I installed new Denso Iridium plugs. After all that I have noticed a pretty good improvement in my MPG. I was getting about 16.8mpg and now I am getting about 20.5mpg (22mpg by the computer). I dont think the transmission fluid, transfer fluid or plugs had ever been changed by the look of it. Two days of work was definitely worth it to get it running a lot better and I am loving the mpg increase. Next I am going to do the diffs which I'm sure have never been changed either.
 
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If the plugs were actually 102k miles old then they were a good candidate as to your increase. But being iridium had NOTHING to do with it. You would have gotten the same results with copper core plugs.

Cleaning a dirty MAF sensor is also a good bet as to your increase gas mileage.

It's always good to change your fluids. But they will have little to no help to increase gas mileage.
 
I know that Iridium had nothing to do with lol. That's what is in it from the factory. I just putting out info on what I did.
 
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