O2 Sensor MPG

[Explit Player]

So most of my o2 sensors are bad. And i am just curious on if this is messing with my MPGs or not because i only get 11 city...

2005 5.7

35in tires also, so that is bothering milage too, but seriously... Only 11?

 

[jwheeler]

How do you know they are bad? Why not replace them? But yes, if the up stream sensors are faulty, it will have an impact in mileage.

 

[usaf2006]

Stock 06 reg cab short box with 265's and 5.7, just changed plugs and im getting about 16 with 80%city driving
Modest driving habits too.. hows ur driving?

 

[XenoMorph]

I'm having a similar issue... 2005 RAM 1500 4.7 SLT... I've owned the truck for 2 weeks... Last week my truck threw a check engine light... and now I'm only getting 11mpg... I took one trip about 4 hours away... Stop and go traffic towing 2 racebikes and luggage and I got 13mpg... Mine goes to the dealer on Tuesday... I have a warranty so it's going to the dealer.


Seems as though these mpg issues are a common thing?

 

[xb1230]

I have a 4.7L as well and in the city with very modest driving I get around 10~11 MPG. However on the highway I get almost up to 19 MPG which is not so bad.

Also I'm running the smaller tires (245/70 R17) and I have 3.92 Axle Ratio on a 2002 4x4 Quad Cab Long Bed.

5.7L with 35", I'm not that surprised you are doing 11 MPG. I'm curious as to how you cam about to say you have defective O2 sensors? Is your CEL on? Did you hook-up a Scanner and got some DTC?

Without being defective, O2 sensors can get lazy at one point and really badly influence your MPG. But unless you have read your o2's output and have a near flat line on the readout, and no CEL, I doubt your sensors are cooked or lazy.

What kind of Plugs are you running? The 4.7L and the 5.7L really hate anything other than standard copper core plugs. By far you will get the best results with the original CHAMPIONS. For the 4.7L use Champions 439. I don't know which they are for the 5.7L but switching from Higher end plugs back to standard copper core, I have noticed a huge difference in both MPG and performance.

 

[jwheeler]

I'm having a similar issue... 2005 RAM 1500 4.7 SLT... I've owned the truck for 2 weeks... Last week my truck threw a check engine light... and now I'm only getting 11mpg... I took one trip about 4 hours away... Stop and go traffic towing 2 racebikes and luggage and I got 13mpg... Mine goes to the dealer on Tuesday... I have a warranty so it's going to the dealer.


Seems as though these mpg issues are a common thing?

Do you know what code?

 

[XenoMorph]

I just posted it on another three but it's: P 0456

 

[jwheeler]

I just posted it on another three but it's: P 0456

Oh I didn't see. That's a small evap leak. Will have zero impact on fuel economy. My money is on a bad esim

 

[Explit Player]

I use a Diablo T1000 and its throwing codes, let me go look what they are

 

[Explit Player]

I have code P0158 bank 2, sensor 2

P0138 bank 1, sensor 2