Officially Disappointed with the 6.4 - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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Old 02-22-2011, 01:14 PM
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Officially Disappointed with the 6.4

Well, I took my 08 that I got a few months ago on it's first road trip...a whole 3 hr drive each way down to College Station, TX and back. Was hauling a 16' tandem trailer w/ one motorcycle on it. On the way down there, I fought a pretty bad crosswind and I got a whopping 11mpg and on the way back got a whole 13.4mpg with no wind. All highway, and I officially hit the lowest MPG's I've ever got in this truck so far.

Seriously, this is just disappointing. I put on a Mini-Maxx, DPF/cat delete, S&B intake, and nothing has improved. Love how my lie-o-meter says 20.6mpg, but it's far from that.

I've tried every different tune available, and have got nothing better than 14.2mpg and the higher the power level, the worse the mileage I get.

What chaps me even more is my buddy who has a 2010 F250 w/ 38's and no performance is getting 13.5mpg hand calculated!

Sorry, just had to rant. Starting to wish I had just bought a damn Dodge for cyring out loud....or at least a gasser for this piss-poor performance.
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Old 02-22-2011, 01:27 PM
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It may be the fuel. They use a winter blend this time of year and I notice I get worse during the cold months but in summer it goes back up. I've also experiance some bad fuel at one station near my home. I've tried it a couple of times just to make sure. It just doesnt burn good or something. Another thing I noticed is the speed you travel. In my 6.0 if I go over 65mph say good bye to the fuel and hello to the station.
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Old 02-22-2011, 01:27 PM
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Sorry to hear your disappointed man. I have had pretty good luck with my truck and fuel mileage.
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Old 02-22-2011, 01:33 PM
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I'm here in Ft. Worth, TX and it's been a nice 60+ degrees here for over 2 weeks now. I've gotten fuel from Chevron, Shell, and even WalMart and no improvement of one over the other.

I know I have 37's and I realize that is def a factor, but I've read too many people on here claiming 15-17mpg's, and 11mpg's hauling less than 1k pound trailer is ridiculous!

Now, I'm really scared to go pickup and haul the 32' AirStream that my fiance's grandparents gave to us. Wondering if I'll even see 5mpg with that thing....
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Old 02-22-2011, 01:41 PM
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I'm running a stock truck on 37's and pulling nothing I got 13.2 mpg out of my last tank (went 385.6 miles and put 29 gallons back in it). It seems these things are all different.
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Old 02-22-2011, 01:55 PM
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Quote:
Originally Posted by Suthrn View Post
I'm running a stock truck on 37's and pulling nothing I got 13.2 mpg out of my last tank (went 385.6 miles and put 29 gallons back in it). It seems these things are all different.
Is your speedometer corrected for the tire size? When you drive an actual mile with 37's, your odometer doesn't show it....if the speedometer is not corrected for tire size that is.
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Old 02-22-2011, 01:56 PM
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Speedometer has been corrected for tire size via the Mini-Maxx...I even measured the tires themselves are they are actually on 36.25" tall, so it should be spot on.
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Old 02-22-2011, 01:59 PM
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I only gained about one mpg towing. I get between 9-11 mpg towing my tall enclosed that is about 11k. I Do get around 19-20 on the highway. Even towing 6k drops me to 13. It drops fast...
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Old 02-22-2011, 02:02 PM
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Originally Posted by Ipkyss View Post
I only gained about one mpg towing. I get between 9-11 mpg towing my tall enclosed that is about 11k. I Do get around 19-20 on the highway. Even towing 6k drops me to 13. It drops fast...
Well at least you're getting 9-11 hauling 11K pounds! I was hauling 1/11th of that getting the same mileage.
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Old 02-22-2011, 02:29 PM
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Originally Posted by txaggie929 View Post
Well at least you're getting 9-11 hauling 11K pounds! I was hauling 1/11th of that getting the same mileage.
I would think something is wrong with your truck . Is the air filter clean ? What kind of mile per hour are you running . My truck (not a 6.4) does great up to about 70mph anything over that , falls like a rock .
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