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6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.

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Old 04-28-2009, 12:35 PM   #1 (permalink)
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Fuel Consumption at Idle

As the title suggests, does anyone know the fuel consumption of the 6.4 motor while at idle as stated in gallons per hour?

Need to know for a proposal for some work where we will have trucks sitting idle for long periods.

Thanks in advance for your help.
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Old 04-28-2009, 05:19 PM   #2 (permalink)
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As the title suggests, does anyone know the fuel consumption of the 6.4 motor while at idle as stated in gallons per hour?

Need to know for a proposal for some work where we will have trucks sitting idle for long periods.

Thanks in advance for your help.
Sorry I don't have the fuel consumption at "idle", but I'm always curious why someone needs to idle for extended periods.

Diesels do not like to idle. They work best in their power band with little variation, but "idle" isn't it. If they need to sit for long periods used as a PTO, they should be idled up to about 1250 rpms (min) or what the PTO requirement will be. A 6.4 will regen MUCH more frequently at idle than in it's power band. So figure your fuel consumption at something over 1200 rpm.

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Old 04-28-2009, 08:38 PM   #3 (permalink)
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I don't know about "gallons per hour" because there are way too many variables..... temp, rpm, electrical load, probably some I forgot....

Diesels like to work... they like to have hot combustion chambers.... they weren't built as noisemakers... they were built to do stuff.... Does someone buy a mine truck because they like noise? No... they want to move dirt... lot's of it.. lot's of it all at once.

FWIW... there are a lot of BIG diesels that get to idle for long periods of time.... they get to do that because they are friggin' hard to get started.... not because they sound nice sitting outside...

Oops. nearly forgot.... that works out to zero miles per gallon....
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Old 04-28-2009, 08:55 PM   #4 (permalink)
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As the title suggests, does anyone know the fuel consumption of the 6.4 motor while at idle as stated in gallons per hour?

Need to know for a proposal for some work where we will have trucks sitting idle for long periods.

Thanks in advance for your help.
We figure our 15 liter big truck engines use about 1.5 gallons per hr. I would guess 6.4 at about 1 gallon per hr.
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Old 04-29-2009, 10:58 AM   #5 (permalink)
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Fill fuel tank, idle for one hour, fill tank. Now you know exactly how much it burns per hour. Simple!
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Old 04-30-2009, 04:20 AM   #6 (permalink)
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I bet it's less then 1 gal per hour because I have to sleep in mine lot's of times inbetween jobs while traveling away from home and it doesn't burn much at all after hours of idleing.
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Old 05-03-2009, 03:31 PM   #7 (permalink)
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for what it is worth ford says one hour of fast idle (1100rpm) equals approximately 33 miles of driving.
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Old 05-03-2009, 04:21 PM   #8 (permalink)
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I get about 350-400 mpg, so if an hour of idle equals 33 miles, then after 11 hours I would be on empty? Seems like that wouldn't be right. I've slept in mine overnight in the cold - 8 hours of idle - and haven't spent more than a 1/4 tank. I'd like to know a definitive answer though. Not saying you're wrong, I guess Ford would know better than anyone else.
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Old 05-03-2009, 09:21 PM   #9 (permalink)
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I get about 350-400 mpg,

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Old 05-03-2009, 09:29 PM   #10 (permalink)
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6.0/6.4 Fuel Economy:
Ford vehicles equiped with the 6.4 PowerStroke diesel are not rated for fuel economy by the EPA. If economy is in question, a boost test should be performed. If boost reaches 22-25 PSI in third gear, wide open throttle under load, then the engine s operating normally and no economy related repairs need to be performed. If not in specs, then the engine will need to be diagnosed--check sensor reading, VGT and EGR operation, fuel pressure and quality, crankcase pressure, intake or exhaust restriction, exhaust or CAC leaks.
Fuel economy will be affected by many factors, including: excessive idle time (one hour equals approximately 33 miles of driving), fuel quality and blend, ambient temperature, driving habits, vehicle use, towing, loads, add-on accessories. Broadcast Message 1271, 4450, 6989

Actually, it does seem high, by their numbers you would burn a gallon and a half of diesel in an hour (assuming you get 20mpg) of idling. I don't know i would bid it at .75 gal per hour and if you are high then you will break even with the more frequent oil changes and regen cycles.
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Last edited by rock_doctor; 05-03-2009 at 09:33 PM.
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Old 05-04-2009, 10:38 AM   #11 (permalink)
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