New to Super Duty Trucks and Diesel Engines......need guidance - Ford Powerstroke Diesel Forum
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post #1 of 37 Old 06-10-2012, 02:41 PM Thread Starter
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New to Super Duty Trucks and Diesel Engines......need guidance

Hey fellas, I have some questions.......I just recently traded my Dodge 1500 2wd (which I loved) for a 2011 F250 4x4 with the 6.7 (which I love so far). My new ride is an XLT with a lift, I'm thinking a three inch, but I'm not sure with 20 inch after market wheels and Nitto 295/65/20 big dumb looking mud tires. I was told the mileage with the 6.7 would be about 20-21 mpg, needless to say I was disappointed with the 12.7 mpg I'm actually getting. I just towed my toy hauler about 400 miles round trip and got a whooping 7.5 mpg, same as I was getting with my 09 Dodge. The toy hauler is 26 foot and weighs around 8k lbs. I have been driving ultra conservative. The only thing I can think of are the stupid soft mud tires. I like the look and stance of the truck, will a different type of tire the same size help me with fuel mileage?

Also, the dealer told me to change the oil every 5k miles, but the book says every 7.5k. My guess is Ford is just trying to make an extra penny, but I want to be sure. The engine has zero after market mods and I'm gonna keep it that way for now, I would rather pay a little more for fuel rather than screwing up this motor. Any words of advice from the sensei's of all that is the 6.7 Powerstroke would be appreciated.

Drew

Last edited by skyfuzz; 06-10-2012 at 03:01 PM.
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post #2 of 37 Old 06-10-2012, 02:59 PM
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I changed mine at 7400 and only thing had to do before that mark was the DEF tank refill at 5k.

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post #3 of 37 Old 06-10-2012, 03:30 PM
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I'm wondering if, after the lift/tires/whatever you've done to it, if you adjusted the speedo to match the new size. Otherwise, numbers and mileage would be off.



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post #4 of 37 Old 06-10-2012, 03:33 PM
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I've been getting 18-20 city and 22-24 highway non pulling, its a 2wd eclb with the 6.7l .... Ive been averaging 700 miles per tank and that's half highway half city, keep the boost under 10 on every shift so slow starts and around 63 mph which will put you around 1500 rpm I have a thread called creatin chaos that talks about the 6.7, also figure out what gear you have in your rear end, I believe mine is a 3.34 ill go check tonight
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post #5 of 37 Old 06-10-2012, 03:38 PM
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It's a 3.31 rear gear with the 6 speed auto trans
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post #6 of 37 Old 06-10-2012, 03:48 PM
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hmm well tires and lift probaly have alot to do with it my guess is the nitto tires u have are mud grapplers cause i know the trail grapplers would not drop it that much
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post #7 of 37 Old 06-10-2012, 03:57 PM Thread Starter
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I bought the truck used with the lift/wheels/tires already installed. I did not even think about having Ford recalibrate the computer for the bigger wheels and tires. The tires are Nitto Trail Grappler 295/65R/20s. Apparently these are the only tires on the planet made in this size. KK, do you use the same tires? If so, what are your results? Thanks for all the input thus far.

Drew
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post #8 of 37 Old 06-10-2012, 04:09 PM
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Tires and lift will make a huge difference if the truck is stock, the wider the tire the more friction/ and resistant on the road way... Take my 02 for example, I'm running 22.5 alcoas but I have a very thin road radial tire for less tire resistants when I drive and that truck has an 8" lift and I still get 17 mpgs but I am also running a mild/hot tune and its not stock, straight exhaust with no restrictions
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post #9 of 37 Old 06-10-2012, 04:12 PM
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Quote:
Originally Posted by skyfuzz View Post
I bought the truck used with the lift/wheels/tires already installed. I did not even think about having Ford recalibrate the computer for the bigger wheels and tires. The tires are Nitto Trail Grappler 295/65R/20s. Apparently these are the only tires on the planet made in this size. KK, do you use the same tires? If so, what are your results? Thanks for all the input thus far.

Drew
i dont have experience personally with a superduty i will be getting my lift wheels and tires on my new superduty next month but on my 2011 f150 ecoboost i totaled last month i had 20x9 wheels with 33in nitto trailgrapplers with a 2.5 in level kit and it dropped my gas mileage about 2-3 mpg and i never reproggrammed my speedo but it was dead accurate with the new stuff but my mpg and DTE were inaccurate
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post #10 of 37 Old 06-10-2012, 04:56 PM Thread Starter
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I understand the whole rolling resistance thing, my guess was that could be the issue. I definitely want to have the calibration looked at, not that it will make a huge difference in the check book, I would just like so have some sort of idea. KK, sucks you total the 150, I hope everyone was okay.

one other question I have is fuel tank size, this one seems to be huge. They told me 36 gallons at the dealer. I filled up at a quarter tank and I put in 39 gallons, I'm no genius, but I'm thinking a 39 is more than 36. I have looked and looked for optional Ford fuel tanks and have not found a thing........needless to say I'm getting use to this fuel shock thing.......I'm just happy knowing every time I fill up some tree huger somewhere is crying.
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