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Old 09-11-2012, 08:49 PM
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6.4 MISERABLE fuel mileage please help guys!

Alright fellas I have an 08 250 6.4 ecsb. Has xrt,5inch downpipe back,intake around 93k. I am having a major issue with the fuel mileage on my truck. About !15-16! on highway/here and there..! And that's not running it hard just normal. is what I get on the highway mixed with some other driving. I was getting. I was getting better with the dpf still on it!! I've heard of guys getting atleast a little over 20mpg... I have also threw the diesel clean to it also as I try to all the time. There is nothing wrong with the truck at all it's healthy as a horse and runs like a wicked 6.4 does. I have the proflo egr delete kit which I am installing this month. Even though the egr system is turned off could this be why my mileage is so bad? Which engine tune and trans tune should I run for safest best mileage with performance? If I can't see any better mileage out of this rig I am afraid I will start to think about replacing it with something else. Thanks a lot in advance.
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Old 09-11-2012, 09:21 PM
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Sadly 15-16 is about right. Some guys brag about 20+mpg with these trucks but either they really suck at math or their pants are on fire....... I assume that's hand calculated, not dash read-out.
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Old 09-11-2012, 09:57 PM
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Quote:
Originally Posted by 44magnum View Post
Sadly 15-16 is about right. Some guys brag about 20+mpg with these trucks but either they really suck at math or their pants are on fire....... I assume that's hand calculated, not dash read-out.
Well put....Tuned and deleted I get about 12.5 City (Chicago) and empty on the highway I get about 17 +/- These are real hand calculated number....and they suck, but I love my truck.

BTW....I run the H&S 250 tunes with the SM1 Tranny tune.
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Old 09-11-2012, 10:03 PM
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Sounds about right for a 7000lb+/- truck
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Old 09-12-2012, 06:28 AM
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yep, that's what your gonna get realisticly. heck my dually I average around 12-13 most of the time, but it weighs 9200+ with 4.10 gears, can hual/tow anything I need, and can run 13.9 in the quarter. People claiming 20+ either believe the dash and don't actually calculate it or always drive empty highway miles and admit to driving like a grandpa taking a long time to get up to speed and then letting off the gas and coasting as long as they can to a stop. You pretty much need a stripped down 2 wd truck to get 20+ at all consistantly, and a stick also helps.
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Old 09-12-2012, 06:59 AM
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I only get 13 mpg with a 5" pipe, Volant Intake and running Spartan's 210.
My truck is a super cab.

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Old 09-12-2012, 02:25 PM
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Oh wow maybe these 6.4s do just like the fuel..but well worth it when you hammer on it and everything in your cup holder goes to the back floorboard....=) whoops I need to hand calculate it I was going by the computer avg econ lol

Seems like the lighter the tune the better the mileage usually the opposite..


atvrider93- would ya wanna trade that obs 350 in your pic for an excursion? lol

Thanks
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Old 11-02-2012, 08:19 PM
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I get 15-16. As somebody else put it, ( in better words) "do you really expect it from the baddest truck on the road"

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Old 11-02-2012, 08:47 PM
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I religiously get 15 mpg , city driving (also chicago area) ,highway CCLB ,Driving WOT or just trying to watch what im doing (which doesnt happen to often up this way), Its an 8500lb truck !! You also can drive in a ranger or damn near any other truck and still only get 15-16 , so pretty good IMO !! Also some guys were /are getting 10-12mpg , so its luck of the draw ,
Also another alternative is Gearvendor overdrive kits they claim in mpg in the mid twentys!!! but pricy , but what isnt , GD lck

Last edited by diesel23; 11-02-2012 at 08:49 PM. Reason: forgot something
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Old 11-02-2012, 09:31 PM
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13.0 mpg with my 2008 f-450
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