Mileage drop
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Senior User
Joined: Nov 2004
Posts: 196
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From: Texas
Mileage drop
I'm trying to figure out something. My scan guage and my on board computer vary up to 3 mpg. Are they the info from the same source? Anyway I know the most reliable info comes from pencil and paper.
However I'm not sure why I should go from 16-18 mpg solo ang 8-10 mpg towing to 11-12 solo and 6-7 towing. An
M I missing something?
2004.5. 6.0.
However I'm not sure why I should go from 16-18 mpg solo ang 8-10 mpg towing to 11-12 solo and 6-7 towing. An
M I missing something?
2004.5. 6.0.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,253
Likes: 763
From: Houston, Texas
You might have picked up some bad fuel, especially since this happened out of nowhere.
You may also have your first tank of winterized diesel. Winterized or #1 diesel has less BTU and kills fuel economy. Consider stopping by Autozone and picking up a bottle of Stanadyne Performance Formula (blue label). It costs $7.99 and will bring the general quality of the fuel up.
You may also consider picking up a scangauge to monitor your FICM voltages as this could also be a reason why your fuel economy is dropping. If your FICM voltages are less than 47-49 volts, the power side of the FICM must be replaced.
You may also have your first tank of winterized diesel. Winterized or #1 diesel has less BTU and kills fuel economy. Consider stopping by Autozone and picking up a bottle of Stanadyne Performance Formula (blue label). It costs $7.99 and will bring the general quality of the fuel up.
You may also consider picking up a scangauge to monitor your FICM voltages as this could also be a reason why your fuel economy is dropping. If your FICM voltages are less than 47-49 volts, the power side of the FICM must be replaced.
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 196
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From: Texas
I know. The mileage I have noticed is over a period of time. The figures used are on level terrain with not much wind. In fact the other day I was towing with wind to the back. The on board computer said 10.9. The scan guage said 7.8. I didn't have time to stop and fill up then do the arithmetic. I was mostly wondering why those two would vary so much. I assume they both get readings from the FICM. Just curious and wondering if I should be watching something I don't know about. Also I was doing around 60 mph and rpms about 1975. I did some miles on tow mode and some in overdrive. Didn't notice any diff
Posting Guru
Joined: Nov 2012
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Even the quality of the fuel and useing cruise or not can come into play.
I recently rented a car to go to a funeral. Going we used a high grade fuel negligable wind either direction. No cruise couldn't find it LOL
Comeing back we filled up at a walmart 10% ethanol and figured out how to use cruise. Used 3 gals more gas going than I did comeing back. Was a gasser tho.
I recently rented a car to go to a funeral. Going we used a high grade fuel negligable wind either direction. No cruise couldn't find it LOL
Comeing back we filled up at a walmart 10% ethanol and figured out how to use cruise. Used 3 gals more gas going than I did comeing back. Was a gasser tho.
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