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Old 09-13-2008, 12:49 PM
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low fuel mileage help

I just bought a 1997 F350 7.3L with 111000 miles and an auto 4x4. I am only getting 13.75 mpg. Does anyone have any sugestions as to why my mpg is so low. I had a 95 that got 22 mpg. Thanks for the help!!!
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Old 09-13-2008, 07:42 PM
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4x4 auto? That mpg is normal if so. What does that truck have and what did the 95 have.
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Old 09-14-2008, 01:55 PM
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the 95 was

an auto trans 4x4 3/4 ton. it was all stock and it got 20 to 22 mpg.
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Old 09-14-2008, 03:06 PM
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I have had three 7.3 97 one f250 with 4;10 only when 15mpg at best on hwy now i have af350 3;55 and thats ony getting 17mpg at 65mph both truck were 4x4 try keeping the tach under 2000 for best mpg this ULSF as played h LL on my mpg my 350 as no cat w/ down pipe and edge tuner in tow mode good luck
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Old 09-15-2008, 04:02 PM
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I forgot to ask what ratio he has. My 96' 4x4 has 4:10s and i get 13 min (country driving, alot of slowing down, acceleration, turning, and hills.) I have never testing interstate driving but mixed highway with alot of stop and go i get 15-16. One time I took a trip to the jersey shore a few weeks ago. Got 22' cause I was interested forced fill.
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Old 09-15-2008, 04:22 PM
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i have a stock 96er 4x4 auto with 4:10's. heavy city i get 13mpg. all freeway i can hit 17.5 with a little bit of effort.
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Old 11-13-2008, 06:16 AM
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I just bought my F350 and drove it home from Orlando. I only got 11-12 mpg, but I was running 70-72 mph most of the way. That's 2300-2500 rpm (4:10 gears), so I guess that's to be expected. I live in a rural area so I'm hoping to get 15 mpg or better. I went from a 98 Chevrolet 2500 with 3:73 gears to this. No comparison. I did get 17-19 mpg with the Chevy though.
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Old 11-14-2008, 08:57 AM
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my cc 95 is an auto 4x4 with 3.55's and best i got was 22 mpg (imperial) highway at a hair under 2000rpm. If i'm driving on 55 mph roads in o/d the rpms are too low and it actually takes more fuel than if i leave it in drive. I can drive on 55mph roads and a lil bit of stop and go and the mileage is crap. Only way to get 20 plus on mine is on a highway going constant speed anything else ~15-17 mpg again imperial.
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Old 11-15-2008, 02:47 PM
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My 4x4 crew cab auto gets 18mpg mixed driving.

EDIT: and thats with 4.10s

Last edited by CR&C; 11-15-2008 at 03:00 PM.
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Old 11-15-2008, 02:55 PM
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my x-cab got 16.7842 mpg when i was in school that is with 4:10 and 4x2 manual. i was doing 85 the whole whay. rpms clost to 3k
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