Sudden drop in AVG MPG reading. - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 10 (permalink) Old 04-15-2010, 03:13 PM Thread Starter
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Sudden drop in AVG MPG reading.

Has anyone else experienced a sudden drop in their readings for AVG MPG? That happened to me the other day, as soon as I turned on my Commander the reading dropped really quick, I was at an AVG 17.0 MPG and it went down to about 12 MPG, it was odd. It kept dropping as I was driving. It has now come back up to 17.2 but it took about a week to return to where it was. Is this something that I should be concerned about? I'm thinking maybe a faulty sensor? Any ideas?

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #2 of 10 (permalink) Old 04-15-2010, 04:36 PM
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It is real time sensing, you most likely were getting worse gas mileage at the time for some reason.



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post #3 of 10 (permalink) Old 04-15-2010, 06:11 PM
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Mine dropped down to 13 and has stayed there since the lift and tires - it only goes up that high when I'm driving on the highway!

2006 Inferno Red 3.7L 4x4 QTI, RR 2.25" Lift, AEV Pintler 17x8.5" Wheels, 255/75-17 BFG M/T KMs, K&N CAI 77-1545KP, MagnaFlow Muffler, 4XGuard Side Guards, Rear Grab Handles, Front Tow Hooks and OEM Trailer Hitch, Fog Lights, Yakima MegaWarrior w/ Extension and 4XGuard Belly Guard.
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post #4 of 10 (permalink) Old 04-20-2010, 09:03 AM Thread Starter
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I've had vehicles before with a real time AVG MPG indicator and I have never seen the reading drop that fast, it went from 17 MPG down to almost 12 in a matter of like 15 minutes and my driving habits didn't change. I commute about 90 miles a day to and from work on the highway so my average MPG were still slowly going up. It was very strange and concerned me that something was starting to malfunction. It hasn't happened since but I did notice that now the reading fluctuates a little more, usualy between 17.4 and 16.5. I'll keep my eye on it and hopefully it's normal and not a sign of something starting to go awry.

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #5 of 10 (permalink) Old 04-21-2010, 09:28 AM
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Maybe you bumped the reset button.

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post #6 of 10 (permalink) Old 04-21-2010, 10:00 PM Thread Starter
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Hmm, didn't know you can reset the reading, that could be it since I jumped in when my Commander was on.

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #7 of 10 (permalink) Old 04-22-2010, 08:11 AM Thread Starter
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Ok so I discovered this morning you can reset the average MPG reading so apparently I did reset it accidently as I climbed in and since it was idling the reading suddenly dropped since technically I wasn't moving and I was burning gas. Problem solved!

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #8 of 10 (permalink) Old 04-22-2010, 08:28 AM
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Another solution made possible by group contributions, cool!



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post #9 of 10 (permalink) Old 04-22-2010, 09:39 AM
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If you hit reset it will go to zero and start recalculating, usually very high.

I suspect that you were getting 17mpg but sitting there idle the computer measured fuel consumption but no miles. Therefor it would think, eventually, zero miles per gallon.


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post #10 of 10 (permalink) Old 04-22-2010, 02:13 PM Thread Starter
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Yep, that's what I think Fohn Jargo, it was just a scary thing to see, I thought I was already starting to experience an issue with my new Commander.

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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