2008 F-450 King MPGs (tunner, DFF delete) - Ford Powerstroke Diesel Forum
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Old 01-19-2013, 09:49 AM
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2008 F-450 King MPGs (tunner, DFF delete)

DPF, EGR Delete w/ AFE Cold Air Intake and a 5" Stainless exhaust just installed - Okay now I am really confused!!!! I just purchased and installed all of the above on my truck. While I really didnít do it to improve the power, torque and such as it has plenty, I did do it to improve the air flow and (MPG if possible) and save the engine with all the junk the manufacture puts on it.

I purchased the truck one year ago and have been monitoring the MPGs religiously over the last year. I have been averaging 12 mile per gallon with every fill up and that is with readings from the truck as well as hand calculations. I never run it below a half tank, it is primarily in town driving and I am very light on the pedal.

After installing all of the above I have been checking my mileage and I am getting worse gas mileage than prior to installation of all parts, I am now getting (hand calculations 9.4 mpg / truck readings are 11.0 mpg). Same conditions (in town driving and very light on pedal).

Now I have not used any of the other modes (e.g. mild, hot), I kept the tuner on no power mode, and was wondering if I actually need to run it on one of the other modes and not on no power to see improvement? The truck is running great and I have no complaints, but I would have thought I would see some improvement with MPGs if only barley.
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Old 01-19-2013, 09:56 AM
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Unfortunately most DPF delete products are intended/designed for off road usage so fuel mileage claims are not usually advertised.

That being said, most have found the best mileage on the highest/hottest power setting.

Depending on your location, the cold weather and winter blended fuel beats the mileage down as well, tuned or not.
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Old 01-19-2013, 10:01 AM
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See I would have thought that i would get worse milage on the hottest or higher setting, i actually did move it up to the mild setting today when i fuled up. I would love to run it on the hot settings as you can really feel the differance. I am also in Ohio where its friggin cold...........
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Old 01-19-2013, 10:23 AM
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Quote:
Originally Posted by Gunnz View Post
See I would have thought that i would get worse milage on the hottest or higher setting, i actually did move it up to the mild setting today when i fuled up. I would love to run it on the hot settings as you can really feel the differance. I am also in Ohio where its friggin cold...........
Spending a couple grand on all the upgrades sucks to see no improvement with mpgs. I would have saved it and spent it on fuel
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Old 01-19-2013, 11:41 AM
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I run spartan. But I see the best mpgs on the higher tunes. Try running the hot setting with a trans tune to match. I bet you will see a decent improvement. Also when I baby foot mine my mileage drops but when I drive normal with a few heavy pulls on to the highway my mileage is best.
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Old 01-19-2013, 11:53 AM
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Run it on hot and go easy on the foot and you should see a great difference
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Old 01-20-2013, 05:59 AM
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Is it really good to keep run as well as keep it on the hottest setting? I would think you would only do that in short burst and/ or durations. As stated I would love to run on the hot setting all the time. I'll move it to hot and run it for a tank or two and see what the differance is.

thx
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Old 01-20-2013, 07:24 AM
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My truck is set on kill, all the time. No issues.

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Old 01-20-2013, 08:52 AM
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2008 F-450 King MPGs (tunner, DFF delete)

I run the Spartan 300 daily. It runs great and my mileage is up from 13.5 stock to about 16.5 (both are city/hwy averages).

Also since you have a 450 the rear end gear is gonna be really low so your mileage isn't gonna be great anyhow.


Sent from my iPhone using AutoGuide.com App
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Old 01-20-2013, 09:09 AM
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4.30 is probably the highest gear he's gonna have in that big girl.

4.88 the lowest.
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