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Jan 17, 2011 | 06:31 PM

danny2313

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Cross-Country

Joined: Sep 2010

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help

can anyone help me out? i have a 2004 f-250 king ranch 224,000 miles all stock 6.0. never any kind of trouble at all. in the last 5 months my fuel mileage has steadily declind from 16 down to 14.5. i have always filled up at the same station and have recently used different brands with no luck. i drive the speed limit, take off easy and never make chevys look bad by racing. this has been a steady decline in mileage. can anyone tell me what to check or to do to this truck as far as aftermarket parts to improve mileage? thanks.

Jan 17, 2011 | 06:35 PM

High Binder

Posting Guru

Joined: Sep 2009

Posts: 1,441

Likes: 5

Quote:

Originally Posted by danny2313

Sounds like winter fuel and is normal.

Jan 17, 2011 | 06:41 PM

gearloose1

Post Fiend

Joined: Jul 2005

Posts: 6,127

Likes: 6

Codes? CEL?

Maintenance?

Mods?

Do you exercise it by driving it very hard at least a few times a month?

If not, you could have carbon clogging stuff.. and that explains a lot of stuff.

Jan 17, 2011 | 06:43 PM

69cj

Hotshot

Joined: Jul 2005

Posts: 13,834

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From: Middle Tn.

Have you kept up with all maintenance and used only OEM filters?? Very, very important.

Jan 17, 2011 | 07:56 PM

bismic

Fleet Owner

Joined: Nov 2003

Posts: 27,929

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What kind of tires are you running? When I went to my mud terrains, I lost at least 1.5 mpg's as far as I can tell.

Jan 17, 2011 | 10:20 PM

amadas350

Senior User

Joined: Aug 2010

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were are you located? if its been cold for around 5 months then winter fuel could be reason. have you been idling more, carrying around more weight, cooler air in general will reduce mileage.

when i went to my 315 i lost maybe 2-2.5 mpg in city and maybe 1 highway.

Jan 20, 2011 | 11:14 AM

danny2313

Thread Starter

Cross-Country

Joined: Sep 2010

Posts: 80

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all maintenance is done on time, oil is changed at 3500 miles. i know thats a little often for some, but i am a p.m. freak. oil is cheaper than a motor. i do have 18 in tires on it but this problem started 6 months after those were installed. no after market parts. does anyone have a suggestion on a programmer for this 6.0.? i am in east texas and everyone knows the weather here. no loads.

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Jan 20, 2011 | 01:15 PM

tex25025

Post Fiend

Joined: Oct 2005

Posts: 10,626

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From: Plano TX and Brentwood TN

Quote:

Originally Posted by danny2313

I wouldn't get a programmer with the main idea being towards mileage. You might get more, but then you might not. They are by their nature, performance enhancers first. MPG gains are a part of a good advertising campaign that tuner companies have done. Even if you read their literature on it, there are caveats all over the place.

My first guess would be winter fuel. East Texas is a huge area that has different climates. I grew up in NE Texas and at times it has gotten colder then my place in Mid. TN, and that's pretty darn cold. I remember last winter it got below 19°F for quite a long time.

I would also mix up your filling stations, but make sure they are all high volue stations.