Where did all my fuel go - Ford Powerstroke Diesel Forum
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Old 10-15-2009, 11:51 AM
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Where did all my fuel go

So I recently started getting really really bad mileage, I found out a few of the fuel lines on the top of my motor were leaking so I fixed them but my mileage did not increase when I first bought the truck it had 265/70/17s on it with an edge programmer and I was getting like 17 to 19 mpg pretty consistently, but I took the programmer off and sold it cause I wanna get a tw chip and than I put 305/70/17s on there and now I am getting about 10 to 12 mpg which really really sucks. I do not beat on the truck hardly at all, and a lot of my driving is to school and back which is about 25 miles of highway driving. Would my bigger tires and no programmer really cause the mileage to be that bad? I am going broke having to fill it up like 2 times a week now.
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Old 10-15-2009, 12:04 PM
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have you changed your fuel filter and covered the basics?
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Old 10-15-2009, 12:16 PM
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here's a bump
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Old 10-15-2009, 12:23 PM
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Quote:
Originally Posted by bockhold View Post
have you changed your fuel filter and covered the basics?
^^^ What he said
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Old 10-15-2009, 12:59 PM
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yea, I changed the fuel filter about a month ago now
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Old 10-15-2009, 01:05 PM
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hmmmmm I really don't think there is much difference between the tires to make that big of a difference in fuel mileage

Winter blend fuel maybe? I dunno...ain't from up north
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Old 10-15-2009, 01:15 PM
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Well I let it warm up a lot more in the morning now before I drive it cause it gets down to about 30 at night and 40 during the day but that should not make much of a difference. And last winter I still got about 17 or 18 mpg so I dont think its the winter diesel
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Old 10-15-2009, 01:25 PM
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Originally Posted by trevor95f350 View Post
Well I let it warm up a lot more in the morning now before I drive it cause it gets down to about 30 at night and 40 during the day but that should not make much of a difference. And last winter I still got about 17 or 18 mpg so I dont think its the winter diesel
WHEN did the fuel thing start happening? This summer?

If so, my truck did the SAME THING. I had to replace my lift pump, and my fuel mileage never increased. I also noticed that the fuel up here has a TERRIBLE smell to it now. I think they changed the diesel on us up north. I was told that the 500ppm stuff is going to dissapear for good, and it may have. I get terrible mileage on the 15ppm diesel.
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Old 10-15-2009, 01:28 PM
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Originally Posted by weareweird69 View Post
WHEN did the fuel thing start happening? This summer?

If so, my truck did the SAME THING. I had to replace my lift pump, and my fuel mileage never increased. I also noticed that the fuel up here has a TERRIBLE smell to it now. I think they changed the diesel on us up north. I was told that the 500ppm stuff is going to dissapear for good, and it may have. I get terrible mileage on the 15ppm diesel.
no kiddin. diesel clean can only do so much. epa lovers
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Old 10-15-2009, 01:32 PM
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I heard something about Opti-lube in one of my diesel mags this month... Did some calculating, and if it gives the MPG gain that the magazine stated, then id save approx 170 bucks in fuel over the time im using their additive.

I might give it a shot. i cant bust over 14-15 mpg lately.
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