Poor Fuel Mileage
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Trailering
Joined: Jan 2004
Posts: 23
Likes: 2
Poor Fuel Mileage
I use to get 18 miles to a gallon towing or normal driving. Now that we have this low sulphur fuel I have dropped considerably. I don't have an exact number yet.
Anybody have any suggestios on this subject or is it just my truck. 1999 f-250 4WD 7.3L predator diablo tuner on 60HP setting and K&N air filter. Any suggestions appreciated.
Anybody have any suggestios on this subject or is it just my truck. 1999 f-250 4WD 7.3L predator diablo tuner on 60HP setting and K&N air filter. Any suggestions appreciated.
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
First off, how are you calculating mileage? If you are reading the overhead console, you might as well forget about it being accurate, especially with a tuner installed.
Also, have you modded the fuel tank? If not, are you filling up until the nozzle automatically clicks off? Or are you dribbling the last few gallons in until you get diesel fuel in the filler neck?
All of these make a huge difference in how you calculate mileage, and if your calculations are accurate.
As far as improving mileage.... unfortunately there's not much you can do for winter blend diesel. Mileage suffers in the winter time. The usual stuff is keep rpm's under 2,000; egt's @ 600 or less. An economy tune can also help.
Also, have you modded the fuel tank? If not, are you filling up until the nozzle automatically clicks off? Or are you dribbling the last few gallons in until you get diesel fuel in the filler neck?
All of these make a huge difference in how you calculate mileage, and if your calculations are accurate.
As far as improving mileage.... unfortunately there's not much you can do for winter blend diesel. Mileage suffers in the winter time. The usual stuff is keep rpm's under 2,000; egt's @ 600 or less. An economy tune can also help.
Senior User
Joined: Oct 2005
Posts: 135
Likes: 0
From: Southern, CA
cant expect the truck to keep getting great mileage the older it gets, things wear like injectors which arent as effecient as they were brand new. 18mpg towing? towing what, a 5 by 8 foot trailer empty? there is no need to exagerate that much, everyone does a little with there mileage but come on.
o ya get rid of the k/n filter. and use an additive.
o ya get rid of the k/n filter. and use an additive.
Elder User
Joined: Sep 2006
Posts: 852
Likes: 0
From: ARIZONA
say no to K&N.........baaad for turbo............which can be bad on mileage.
check your compressor wheel, see if K&N has let in too much dirt. also
for the winter months, i use PS diesel Kleen in the white bottle every fill up, keeps fuel from gelling and gives you a 4 to 6 cetane boost while lubricating pump and injectors,
just some thoughts,,,,,,,,,,,,,,,
check your compressor wheel, see if K&N has let in too much dirt. also
for the winter months, i use PS diesel Kleen in the white bottle every fill up, keeps fuel from gelling and gives you a 4 to 6 cetane boost while lubricating pump and injectors,
just some thoughts,,,,,,,,,,,,,,,
Senior User
Joined: Jun 2006
Posts: 383
Likes: 0
Have you been changing your fuel filter lately? The switch to ULSD can clean your tank and lines out clogging it prematurely. I just changed mine after 5K miles because I got down to 10-11 miles / gallons. I can immediately tell the difference.
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Posting Guru
Joined: Jul 2006
Posts: 1,346
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From: Visalia CA
Originally Posted by bigtorque
say no to K&N.........baaad for turbo............which can be bad on mileage.
check your compressor wheel, see if K&N has let in too much dirt.
check your compressor wheel, see if K&N has let in too much dirt.
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Posting Guru
Joined: Jul 2006
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From: Visalia CA
Originally Posted by hookd
have you checked for a boost leak?
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