I want to think this could be the cause in my slight loss in MPG, wanted to pick the brains here.
2012 Yukon XL 6.2, 140K miles, owned vehicle since it had 85K and basically zero issues in regards to driveability. Last 3 years we have taken trips to the beach, roughly 450 miles and I could easily do this on one tank. Granted the DIC is not 100%, generally reads about .5 MPG higher than reality. I could get between 19.5 and 20 MPG AVG on the DIC, 70-75 MPH, cruise set, easy going. This trip I averaged 17 on the DIC and the fuel gauge needle confirmed this.
Tires are Defender LTX, 37 PSI, no brakes dragging, calipers are nearly ambient temps when checking at rest area, alignment is spot on, MAF cleaned also.
About 2 months ago, my upstream sensor, bank 1 had a code for the heater circuit, and I needed to change them as they were getting slightly lazy anyway. I went with the Delphi ES20013 from RA and all was good, I am a firm believer in only OE for GM electrical but figured these would fit the bill. Around town I noticed only a slight drop in MPG, nothing major, but at highway speed is where it shows it's face.
This is the sensor.
Here's a screenshot of my Torque app at about 73 MPH, I don't know if the average voltage here will tell a story, not sure where it should be, but I'm looking at about a 15% loss in MPG.
This shot was a little slower around 65 MPH
I can do a compression test later but this seemed to happen right after the O2 sensors change. I'm a firm believer in OE electronic parts for GM but figured these would fit the bill. I might have to just try the AC sensors just to see, but might be worth the price to confirm.
As far as bank 1 pulling more fuel out, one theory could be that a few months after my last beach trip last summer I replaced all my RH rockers as I was developing a "tick", haven't done the LH side yet. So maybe the possible added airflow is needing more fuel, not sure.
All thoughts appreciated.
2012 Yukon XL 6.2, 140K miles, owned vehicle since it had 85K and basically zero issues in regards to driveability. Last 3 years we have taken trips to the beach, roughly 450 miles and I could easily do this on one tank. Granted the DIC is not 100%, generally reads about .5 MPG higher than reality. I could get between 19.5 and 20 MPG AVG on the DIC, 70-75 MPH, cruise set, easy going. This trip I averaged 17 on the DIC and the fuel gauge needle confirmed this.
Tires are Defender LTX, 37 PSI, no brakes dragging, calipers are nearly ambient temps when checking at rest area, alignment is spot on, MAF cleaned also.
About 2 months ago, my upstream sensor, bank 1 had a code for the heater circuit, and I needed to change them as they were getting slightly lazy anyway. I went with the Delphi ES20013 from RA and all was good, I am a firm believer in only OE for GM electrical but figured these would fit the bill. Around town I noticed only a slight drop in MPG, nothing major, but at highway speed is where it shows it's face.
This is the sensor.
Here's a screenshot of my Torque app at about 73 MPH, I don't know if the average voltage here will tell a story, not sure where it should be, but I'm looking at about a 15% loss in MPG.
This shot was a little slower around 65 MPH
I can do a compression test later but this seemed to happen right after the O2 sensors change. I'm a firm believer in OE electronic parts for GM but figured these would fit the bill. I might have to just try the AC sensors just to see, but might be worth the price to confirm.
As far as bank 1 pulling more fuel out, one theory could be that a few months after my last beach trip last summer I replaced all my RH rockers as I was developing a "tick", haven't done the LH side yet. So maybe the possible added airflow is needing more fuel, not sure.
All thoughts appreciated.
