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6.4 Fuel Economy

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Old 06-17-2014, 06:20 PM
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6.4 Fuel Economy

Guys, I would appreciate some verification here. I just completed a round trip from Kamloops to Calgary in my 2009 Lariat SRW Super Crew. Drove a total of 1394.7 kms. which is 866.63 miles round trip mostly highway miles with some city driving around Calgary for a few days.

I pumped a total of 135.69 liters which is 35.85 US gallons of diesel (started with a full tank and ended with a full tank). The truck was empty and I have a Roll N Lock tonneau cover.

By my highly scientific calculations this equates to 24.17 miles per gallon or 9.73 L/100 kms. My truck has both the DPF and EGR deleted and I run the SCT Street Performance tune when not towing or loaded heavy. I was pretty conservative on the skinny pedal and really did not push the truck.

My previous best was just under 22 MPG on a long trip. I was blown away when I did the math, and want you guys to tell me where I screwed it up.
What is the best you have figured with your 6.4??
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Old 06-17-2014, 07:31 PM
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If I recall 16.9 US MPG per gallon, dpf on. I also had a less than aero dynamic front bumper on mine with off road tires.
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Old 06-17-2014, 07:41 PM
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I have a cab-height shell, OEM 18" Continental street tires, DPF delete and EGR turned off via Spartan tune (40hp NEGR, DPF delete) 2010 6.4L.

Before the delete I was getting between 13.5 and 14.5 mpg mixed driving (mostly highway at 70mph, some stop and go in town). After the delete it went up to between 14.5 and 15.5 mpg. Haven't seen anything better than that yet. I have a 6 hour trip to San Antonio and back coming up in July and hope to see if I can get a good highway-only reading that is a little better.

But nowhere near what you are seeing.
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Old 06-17-2014, 09:00 PM
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2008 F250 2WD just went to Traverse City and back Sunday to replace the alternator in the wifes Van. All highway, some 2 lane so between 60 and 75 MPH, some with the air on, windy as all get out. H&S, deleted, running a no HP tune 20.16MPG, hand calculated.
I've heard other people claim 22 to 24 MPG, so sounds good to me.
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Old 06-17-2014, 10:34 PM
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I am thinking it is too good to be true too...I can't see what I missed?

I have a 3.55 rear end and run some regular size Goodyear Wranglers on 18" stock wheels. The weather through the Rockies was good both ways and the truck just cruises at 60-65 mph with no real effort. I was in no big hurry so no smoke shows either way! I can't say any F350 is a study in aerodynamics

I filled up in Canmore on the way to Calgary, topped up on the TCH near the Brooks turn off on the way home, and the filled up in Kamloops when I got home.

It was nice to see the lie-o-meter say "840 KMS TO EMPTY" when I topped it off in Kamloops! Bet I won't see that again anytime soon!
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Old 06-18-2014, 06:08 AM
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I was running 3.73 gears in my truck. 3.55 will help.
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Old 06-18-2014, 11:43 AM
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I think over 20 is possible, but depends how you drive.
Screaming down the road at 70 mph, no friggin way.

Mine has 3.73 gears, and I can get over 20 on highway trips.
Also stock wheels and tire size.

They say the best MPG a vehicle can get, is the slowest speed possible with the torque converter locked. This would be around 80 km/h.
I noticed when driving in BC with mine, most of the time I'm driving a lot slower than on the open roads of the prairies, and the fuel lasts a lot longer.

As much as I hate lowered trucks, a worthwhile investment might be putting airbags and new suspension on one of these trucks, so you could go say 4" lower than stock to 2" higher than stock.
Lowering it on the highway I bet is good for a couple MPG.

I don't believe a tuned 6.4 should have any problems to get great MPG. It's a common rail diesel just like any new diesel engine, and once the emissions junk is gone, I see no downside at all to owning one. In fact I think the 6.4 is actually a tougher engine than the 6.7, although the 6.7 is much nicer 100% stock for sure.
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Old 06-18-2014, 12:11 PM
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My brothers got great mileage. My 6.4 not so much. Key is factory sized tires and a conservative right foot.
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Old 06-23-2014, 12:37 AM
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My DRW 4x4 lifted with 35s and 4.10s was showing on the lie-o-meter around 11.2 MPG before. I have a SCT livewire 9625 Extreme on the performance tune and the lie-o-meter is now showing 16.5 mpg. Thats a 120 hp tune without any deletes. Yours sounds about right.
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Old 06-23-2014, 12:03 PM
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Quote:
Originally Posted by ZPI28 View Post
My DRW 4x4 lifted with 35s and 4.10s was showing on the lie-o-meter around 11.2 MPG before. I have a SCT livewire 9625 Extreme on the performance tune and the lie-o-meter is now showing 16.5 mpg. Thats a 120 hp tune without any deletes. Yours sounds about right.
Lie-o-meter = useless.
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Old 06-23-2014, 12:15 PM
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Quote:
Originally Posted by UGA33 View Post
My brothers got great mileage. My 6.4 not so much. Key is factory sized tires and a conservative right foot.

I think it really boils down to RPM's, and how high the truck is sitting.
Also the tune/ emissions stuff.

Take a 6.4 truck, lower it, tune it and remove DPF and EGR, put 3.27 gears in it, and I bet you'd hit 22-25 MPG.

Of course then, you'd be reducing it's functionality. These things weren't designed to be hyper milers and sip fuel, they are meant to tow and work and drive offroad.
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Old 06-23-2014, 03:14 PM
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Better millage

Just got back from a trip I did last year. 08 F450 4.30 gears pulling 18,600lbs 5er. Last year I was completely stock and averaged 5.8mpg. This year did the same trip but now I have a turbo back exhaust with EGR deleted and H&S on stock tune, I averaged 8.6. Also I was getting 10mpg empty now I get 15, as long as I keep my foot out of it. Love this TRUCK!!!!
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Old 06-23-2014, 10:02 PM
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If 70 mph is "screaming down the road" then I'm doomed! When empty 80+ isn't out of the question here in Texas in order to get from way over here to way over there in time for supper. And I know enough about physics and my fuel bill to understand the detrimental effect that higher rpm's have on fuel economy. I can live with that.

All joking aside, hyper-miling a vehicle has always interested me as a feasibility study to determine a vehicles true (mpg) potential. But not so much in the practical use of a work truck. It's like guys who claim how much horsepower they can make, track speeds or how well they can pull a sled. All great endeavors that prove design innovations so manufacturers can implement them in future truck models. And a hearty thank you to all of you!

However!

I think for highway use your lowering theory is very promising. And it may not even have to be the actual lowering of the truck, it could feasibly be just the lowering of a front air dam from the bumper down towards the road surface. And possibly dams lowered on the sides as well. Tractor rig operators have discovered the efficiencies of dams on the outside bottom edges of their trailers to reduce drag. Dams would be lighter than suspension components and cheaper to install as an after-market product. Think of the retractable step bars sold today.

Push a button for improved highway mpg's.

Now go file a patent!

Quote:
Originally Posted by parkland View Post
I think over 20 is possible, but depends how you drive.
Screaming down the road at 70 mph, no friggin way.

Mine has 3.73 gears, and I can get over 20 on highway trips.
Also stock wheels and tire size.

They say the best MPG a vehicle can get, is the slowest speed possible with the torque converter locked. This would be around 80 km/h.
I noticed when driving in BC with mine, most of the time I'm driving a lot slower than on the open roads of the prairies, and the fuel lasts a lot longer.

As much as I hate lowered trucks, a worthwhile investment might be putting airbags and new suspension on one of these trucks, so you could go say 4" lower than stock to 2" higher than stock.
Lowering it on the highway I bet is good for a couple MPG.

I don't believe a tuned 6.4 should have any problems to get great MPG. It's a common rail diesel just like any new diesel engine, and once the emissions junk is gone, I see no downside at all to owning one. In fact I think the 6.4 is actually a tougher engine than the 6.7, although the 6.7 is much nicer 100% stock for sure.
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Old 06-24-2014, 09:12 AM
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I think parkland is right on... these trucks we're not built with the intention of fuel mileage....that's why most are happy when they can add 2-3 mpg's to their truck...I've noticed dodge/chevy guys are the worse about claiming 25-30 anytime anywhere on 6-10 inch lifts/37's-40's which is BS! If you want the best fuel mileage bUy a 2wd f250 ext cab and leave it stock for the truck's life..or delete it and gain some! To each there own on what there trying to accomplish... I love my truck and it's 12mpg city.. and 7-9 pulling...it's A TRUCK NOT A HYBRID
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Old 06-27-2014, 11:35 PM
JR58 JR58 is offline
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I'm curious. Is it just me, or are those of you getting great fuel mileage running 3:55 gears instead of 3:73s? Shouldn't that equate to around 1700-1800 rpm the so called holy grail of ideal rpm range?
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