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Old 08-28-2010, 02:03 PM   #1
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Thumbs down How does Ford 6.4 L Diesel Hold up?

It is end of year clearance for Ford 2010 models. and there are some very good deals on F250's. 2010 was the last year for the 6.4 L diesel made by Navistar. For those of you that have one of these diesels in your Ford (2008 to 2010), how well do you like them? Most of the dealer stock is the 3.55 rear end ratio. Is this the preferred gearing?


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Old 08-28-2010, 02:08 PM   #2
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I have a 2010 F450 with the 6.4L and 4.30 axle. I haven't towed much with it yet. Truck and motor working perfectly. However get ready for the mileage it gets. i am getting 10 to 12 MPG. The only saving grace about it is that towing or not the mileage doesn't change.

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Old 08-28-2010, 02:11 PM   #3
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rear ends were changed to 3.55 to boost mpg...

since this last edition of the 6.0 is NOT fuel friendly.

with the hp and torque a 3.55 or even 3.31 is PLENTY for all a/s towing needs...

a simple comparison of hp/torque GAINz shows that it was equal to or greater than the % lost of gearing.

the 6.4 was NOT a new drive train....

it was the FINAL EVOLUTION of the 6.0 and the beginning of much tighter emissions for diesel motas...

so it came with the FIRST generation dpf on fords...

you can read ALL about the 6.4 here...

there were interval tweaks and improvements over the 3 year run, so 2010 is the BEST of this lot.

and YES the deals are very very good now...

5,000 PLUS cash back/discounts and below INVOICE pricing are common...

keep in mind the 2010 production run was VERY VERY SHORT...

so they didn't make many of the last year and when they are gone, they are gone!

all of the true things that i am about to tell you are shameless lies. l.b.j.

we are here on earth to fart around. don't let anybody tell you any different. k.v.
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Old 08-28-2010, 02:16 PM   #4
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I have a 2010 6.4L F250 4x4 with 3.55 rear end. Truck and engine are excellent, but the mileage is poor at best. I get about 15-16 on the highway doing 70. When towing a 3500 lb. Airstream at 65, I get 11-12. When towing a 7500 lb. boat, I get 9-10 at 65.

You won't be disappointed with the truck at all if you know the mileage is not great! The 2011 is supposed to be substantially better (3-4 mpg), but you'll certainly pay much more for it...
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Old 08-28-2010, 02:57 PM   #5
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Jim J,

Have a very early job 1 build 6.4 - 3.73 axle - 11.8 mpg towing 8000lbs Airstream 75-80% of the time. Brake pressure transducer failure has been the only fault in 3.1/2 years. Beautiful truck and staying close to me!

John in the UK
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Old 08-28-2010, 03:42 PM   #6
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Consumer Reports voted the 2010 3/4 ton diesel ford as the worst fuel mileage vehicle at 10mpg average, thats half of what a chev Duramax gets.
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Old 08-28-2010, 10:23 PM   #7
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May be that is why Ford designed and built their own diesel for 2011.

1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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Old 08-29-2010, 12:39 AM   #8
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6.4 L Super Duty is very nice...

I have a 2008 F350 extended cab, long box, 4x4, with 3.73 rear end and the 6.4L diesel and to date have racked up 115,700 miles on it, with about 1/2 of that towing either Airstreams or a 5er.

For mileage I get 17.5 mpg when running empty at 65 mph.
Towing Airstreams I get 13.0 mpg again running 65 mph
Towing big 5ers I get 9.0 mpg again running 65.

This is real mpg calculated by actual gallons at the pump dividied by miles ran, and not just taken from the in-dash computer (although that is fairly accurate). The trick to getting decent fuel mileage is to keep your foot out of it. Keep enough throttle to get up to peak torque rpm then just let it pull and the speed will gradually build up.

The truck itself has been perfect so far, zero maintenance except for normal oil/filter changes etc.

So, for my 2 cents I highly recommend the Ford with the 6.4 L engine. I know the new 2011 engine is supposed to be really good, but if I was buying a new truck right now I would either get the 2010 or wait till 2012 model rather than getting a first-year production truck.

best regards...
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Dave&Shari Wagner
2006 Bambi SE,
2008 Ford F350 Diesel 4x4
" I am lost and have gone Airstreaming to find myself, If I should return before I get back, please ask me to wait..."
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Old 08-29-2010, 11:13 AM   #9
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I too have the 08 Ford F-350 with the 6.4 and my milage towing my 34' limited averages 12.5 mpg at 65 mph, calculated the old fashioned way. Around town I am getting 15 mpg on average, and recently I drove to Vermont without the trailer and I got 18.5 mpg at 65 mph.

Whenever I can I use the cruise control set for 65 and I hang as much as possible in the right lane, and I find it is a much easier ride avoiding the crazy lane weaving commuters.

I dislike the fuel warning system that starts at 50 mile to empty, which is always off, as when I fuel up after it tells me I have 25 miles to empty I always have 3 to 5 gals of fuel left.

By the way when we are not on the road I tend to get 3 1/2 weeks on a tank of fuel, as I am retired and do not have to do the daily commute


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Old 08-31-2010, 09:23 PM   #10
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Thanks to all the replies, this has been really helpful. I tend to drive more like Reganzo. The person at the desk next to me has the 2011 Ford Diesel 2WD and really lilkes the gas mileage he is getting. He tows a car hauler with his race car in it, and drives it to work. He is getting about 18-20 in town and 14-15 when towing. He tows at about 70 MPH.


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