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Fuel mileage issues

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Old Mar 25, 2020 | 07:51 PM
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BM0263
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Fuel mileage issues

Currently own 1997 Ford F-350 7.3L Crewcab with 169k miles. Unfortunately it’s a project considering previous owners had added their own touch. But moving forward, my problem now falls on the fact she is only getting 9 miles to the gallon. Thought and researched quite a few options but I was curious as to what everyone thinks could be the issue if there is one, how to fix said issue or any other options.

 
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Old Mar 25, 2020 | 11:35 PM
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9mpg when? My dually does mid 10s city only. 17ish freeway only.

Yours obviously has larger than stock tires. It is a CCLB and 4x4. Not sure what you are expecting. Is the speedo recalibrated?

My 2009 CCLB 4x4 6.4 Lariat did 10.9s city only all the time deleted. Stock was 7.5-9mpg city only.
 
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Old Mar 26, 2020 | 11:49 AM
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What size tires?
do you know if you have 4.10 gearing?

My 95 gets about 19 mpg with 35s on it. have 4.10 gears

do you know fuel pressure? if low it can make it for poor MPGs
 
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Old Mar 26, 2020 | 06:13 PM
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Do you have a way to read data? Check boost levels, if they are low, I would make a leak detector and start looking for bubbles
 
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Old Mar 26, 2020 | 09:40 PM
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Originally Posted by BM0263
Currently own 1997 Ford F-350 7.3L Crewcab with 169k miles. Unfortunately it’s a project considering previous owners had added their own touch. But moving forward, my problem now falls on the fact she is only getting 9 miles to the gallon. Thought and researched quite a few options but I was curious as to what everyone thinks could be the issue if there is one, how to fix said issue or any other options.
Good looking truck
As far as MPG it all depends on how you drive, I have same truck as yours exception of mine being 2wd, mine has 3.55,
305-55/20 tire/wheel set-up, auto and calibrated PSOM, I normally get 15 mpg highway driving like a teen and 11-12 in city only also driving like a teen, if I drive like gramps I can get 17.5 highway doing 65mph, and 13-14 city also driving like gramps.
Hope this helps.
 
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