Terrible fuel mileage 05 6.0L - Ford Powerstroke Diesel Forum
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Old 07-15-2013, 08:20 PM
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Terrible fuel mileage 05 6.0L

Here is what is done to my truck: h-11 studs, RCD EGR delete, brand new oil cooler, sinister coolant filter, s&b intake, 4" dual straight pipe, SCT livewire TS with looney wild from Vivian, blue spring upgrade.

PROBLEM: I only get about 13.5 mpg, usually less, with cruise set around 75 and only slightly hilly driving. I haven't had time to test injectors yet, but what else could it be?

I run T-6 full synthetic with archoil, and have a 4.5" lift with 35s.

I feel like I should get way better mileage than that. Any input would be great.
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Old 07-15-2013, 08:59 PM
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Has the mpg suddenly dropped? Like recently you noticed it, and it had been better prior to this?

Any other symptoms like more smoke, etc?
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Old 07-15-2013, 09:06 PM
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Ive only owned it for a few months. Maybe i just didnt check it out well enough before i bought it. Mileage has always been poor but i hoped after the new tuner with custom tunes, new exhaust, and new oil cooler that it would get better. Truck does smoke white a little upon start up sonetimes, and can idle/run rougher when cold. More black smoke than before, but i figured that was the exhaust and tunes. All I can think is injectors. But would that kill my mileage that much? I have buddies with 6.0s getting 17-19+
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Old 07-16-2013, 12:59 PM
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That mileage doesn't sound too terrible to me. It may be a little low but with 35's and a lift...that might be where you'll sit. Mine is an FX-4 lifted a couple inched with 315's (33's) stock other than blue spring, coolant filter, egr delete and I avg about 15.
I have found it doesn't take much to get the mileage to drop to 13.5-14. Got 16 once on a long trip cruise set at 62
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Old 07-16-2013, 03:49 PM
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Now the trip this morning was 11.4 mpg. I did cruise along a little faster today but damn that's terrible
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Old 07-16-2013, 06:37 PM
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I was getting poor mileage when my ficm was going out. Might be worth checking the ficm voltage..
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Old 07-16-2013, 06:46 PM
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Quote:
Originally Posted by darenative View Post
I was getting poor mileage when my ficm was going out. Might be worth checking the ficm voltage..
same here. When my ficm was bad I got mpgs between 9 and 13
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Old 07-16-2013, 06:56 PM
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Ficm voltage from the livewire 48-49 volts.
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Old 07-17-2013, 03:16 PM
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Quote:
Originally Posted by gleason51 View Post
Ficm voltage from the livewire 48-49 volts.
When? First thing in the a.m. or after you drive 20 miles?
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Old 07-17-2013, 03:34 PM
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It pretty much is always right around that voltage.
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