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I'm new to this I've never been in a chat room before. I own a '05 F350 Lariet and I love the truck but hate the mileage. This is my third diesel ,97,02 and now a 05. My mileage was good on the 7.3 but my 6.0 I get 9.5 around town and 15 on the highway. Whats wrong. i have 373 rear
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Joined: Sep 2001
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Hello- Welcome to FTE! The forums are not a chat room. We have a chat room if you are interested at the top of the page. I have moved your post to the specialized forum we have here for your question. Check out the list of tech forums we have here. There is a wealth of information and expertise here to help you. There are a number of links in my sig below to help you also. Have fun! 
Elder User
Joined: Sep 2005
Posts: 911
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From: Mexifornia
Boy i don't know. I have an '04 3.73 CC SB 4wd and the worst I get around town is in the mid 15's (15.45), and I've gooten as high as 23.65mpg towing my trailer (@5000K lbs) and that wasn't on flat ground either! I recently got just shy of 18 mpg going back and forth to the ranch hunting: which means a 150 mile round trip with up into the mountians and some of that is creeping around in 4wd. Every time I fill up I keep filling (slowly) until the overflow spills, thus I basically fill it the same each time.
I have tried Diesel Kleen (gray) in several tanks but it made no difference, plus my mechanic laughed when I asked him about using it every tank full; saying its not needed.
I have a light foot too, so I'm not getting into it a lot- don't know if that makes a difference- buut from what I've read on here it dosen't. i do have three other friends with 6.0L and they get about the same or a little less, but I do know they drive a lot more agressively than me.
I'd check what responses you get and my dealer told me after the reprogram to be sure to let him know if they was a drop or increase in milage- not sure what he would have done if there was- but he diffinatley made it clear to let him know.
I do have to say the milage has gotten slightly better, or rather more consistant over time/miles. (I have almost 8K on it now)
I have tried Diesel Kleen (gray) in several tanks but it made no difference, plus my mechanic laughed when I asked him about using it every tank full; saying its not needed.
I have a light foot too, so I'm not getting into it a lot- don't know if that makes a difference- buut from what I've read on here it dosen't. i do have three other friends with 6.0L and they get about the same or a little less, but I do know they drive a lot more agressively than me.
I'd check what responses you get and my dealer told me after the reprogram to be sure to let him know if they was a drop or increase in milage- not sure what he would have done if there was- but he diffinatley made it clear to let him know.
I do have to say the milage has gotten slightly better, or rather more consistant over time/miles. (I have almost 8K on it now)
FTE Leadership Emeritus
Joined: Jan 2003
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From: 3rd Rock
Originally Posted by Bobstro
I'm new to this I've never been in a chat room before. I own a '05 F350 Lariet and I love the truck but hate the mileage. This is my third diesel ,97,02 and now a 05. My mileage was good on the 7.3 but my 6.0 I get 9.5 around town and 15 on the highway. Whats wrong. i have 373 rear
There is more to MPG then just the truck
