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Old 08-21-2015, 02:35 PM   #11
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I have an 08 F350 shortbed dually. Tow a 42 foot XLR Thunderbolt. Fuel mileage around home is 10. Doesn't matter city or highway, it gets 10, period. Towing the XLR it averages around 8. Worst was 7.5, best was 8.1. Usually can get it to hang right around 7.8. Motor will pull down a house, but the fuel mileage is horrific. My buddy has 2 450's that he uses for his tree cutting business with 6.4's in them. He only gets around 6, but that's with a heavy box and wood chips on it.
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Old 08-21-2015, 02:40 PM   #12
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I have a 6.4 and love it. Be religious about maintenance. Change the oil every 5000 miles. If you are in an area, where you don't have annual inspections, try to get one in which the Diesel Particulate Filter (DPF) has been removed and the EGR bypassed/deleted. Those two items will greatly improve fuel mileage and cut way down on potential problems. I absolutely love my truck.
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Old 08-21-2015, 03:02 PM   #13
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If I was to buy one, it would get deleted as soon as it got parked in the driveway. When they are in stock form they are choked down so far that you get terrible fuel mileage. And in my opinion they aren't that powerful when stock. Now when you delete the DPF and EGR valve, they run! If you delete with a Spartan Tuner, there isn't very many pickups on the road that can outrun it. And they tend to hold together pretty good too with the added horsepower.


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Old 08-21-2015, 03:17 PM   #14
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Originally Posted by Tonkatoy77 View Post
If I was to buy one, it would get deleted as soon as it got parked in the driveway. When they are in stock form they are choked down so far that you get terrible fuel mileage. And in my opinion they aren't that powerful when stock. Now when you delete the DPF and EGR valve, they run! If you delete with a Spartan Tuner, there isn't very many pickups on the road that can outrun it. And they tend to hold together pretty good too with the added horsepower.


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Aren't ARP head studs advised when bumping up HP/TQ with a tuner?
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Old 08-21-2015, 03:49 PM   #15
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What does delete mean please
It means to remove EPA mandated pollution reduction devices. This will substantially increase the trucks MPG and reliability. You need to buy a tuner which will tell the truck's computer how to operate without these components. It is illegal to do this but nevertheless is commonly done most often after the manufacture's warranty has expired.
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Old 08-21-2015, 03:57 PM   #16
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I have owned a 6.0 and 6.4 diesel. To be honest I wish I had my 6.0 back. And yes, there alot of 6.0's that had problems. I installed the delete kits on both motors. The best I can get from the 6.4 is 11 mpg. I got 14 with my 6.0 pulling 5th wheel and 36' gooseneck flatbed trailers for work. My 6.0 had way better throttle response, power and torque.
But no matter which diesel or brand of diesel you have to be stringent on the maintenance and upkeep schedules. They require much more monitoring and paying attention to them than gas engines.
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Old 08-21-2015, 04:13 PM   #17
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My experience is second hand as I quit driving Strokers after bad experiences with the 6.0. My brother has the 450 with 6.4 and has had lots of issues. It's in the shop now with just over 100k on it for a top end rebuild. EGR system issues, ford garage quoted him $15,300 for the repair... hence, it's in a private shop for the work. He always says it has lots of power for pulling but on his best road trip he hasn't hit 12 mpg.
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Old 08-21-2015, 04:32 PM   #18
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Aren't ARP head studs advised when bumping up HP/TQ with a tuner?

It's always a good idea, but not necessary with a 6.4l. With the 6.0l it is a must.


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Old 08-21-2015, 06:00 PM   #19
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The 6.4L can be a good motor if the deletes are done and tuned properly. On edit the 450 might have a gear ratio of like 4:56, mileage will never be great but boy will it pull.
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Old 08-21-2015, 08:55 PM   #20
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We have an 08 450 6.4L at work and it is the biggest p.o.s. truck I have ever dealt with. It only has 60k, the motor was replaced at 20k (I don't know why), and it's in the shop more than it's used. Even the replacement 6.4 is having problems. Between leaks, constant check engine lights, bad sensors, etc, etc. I know this one is just a major lemon and they all can't be that bad, but I'd never buy one. It's so bad, I transferred it to another unit at my department (LE) so we wouldn't have to deal with it any more.
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