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Old 03-06-2012, 10:32 PM   #15
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'08 Ford diesel dually should only have a 4.30 ratio, unless it is an early model--then it might be a 4.88, which would explain part of the fuel mileage problem.
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Old 03-06-2012, 10:39 PM   #16
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My first glance at that diesel forum seems to be more for rodders than RVers--as are most of the diesel sites.

thedieselstop.com
fordtruckenthusiasts.com

are 2 others to look through...

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Old 03-06-2012, 11:41 PM   #17
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I have the 2008 F250. Same engine. Get between 10-12 towing 7K lbs. I've seen a high of 18 MPG on the lie-o-meter (wish I didn't have that thing in my vision all the time) empty.

I have studied this almost to death. Talked to a well respected diesel garage here in town. He suggested a Chevy! I'm a Ford guy so that won't work. Pretty much concluded that there isn't anything to do about this truck/engine combo. Talked to a couple of guys with the new Fords with the new engine. I did not get the feeling they were doing much better though one guy said he pulled his 12K lb fiver from Phoenix to Parker and got 16 MPG. Thought about crying BS but he seemed proud and what was the point.

I do wish, like the OP that I had studied this BEFORE I bought the 2008. I think I would have bought a slightly older truck with the 7.3. This, though, based on reading the Internet and everyone bragging about the mileage they get with those engines. Remember if men are talking size, and in this case MPG, matters.

I'm thinking of starting therapy to try to stop fixating on mileage and just love the fact that my truck can yank my little camper up any hill and pass rigs while doing it.
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Old 03-07-2012, 08:28 AM   #18
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"I'm thinking of starting therapy to try to stop fixating on mileage and just love the fact that my truck can yank my little camper up any hill and pass rigs while doing it. "

Now you have it figured out...

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Old 03-09-2012, 09:43 PM   #19
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The way you drive has a lot to do with the mileage that you get. You have to find the sweet spot for your combination and try to keep it around that spot. I know I have a chevy, but it doesn't matter, each combination will be different, mine is at 2000rpm, which is around 65, 66 mph. So I keep my speed under 68 and let the truck pull down on the grades, and not kick it out of overdrive until either it starts lugging or the egt, s start climbing too high. I run between 9.5 and 11 mpg depending on head winds and size of the hills.
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