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Old 08-22-2011, 06:03 PM   #1
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Thinking of Upgrading 6.4 to 6.7

Ok I have narrowed my choices to a 2011 F350 C/C 4WD Dually Lariat 6.7. Now just have to justifie if I really want it.
I have a 08 F350 C/C Lariat SB Dually now loaded. I love the truck but it's a Pig. I average 8 to 9 towing our 5th wheel (14,800 lbs) truck pulls no problems. Crusing about 12 to 13.5. The Pig has 52,000 miles and runs great, sad part is just put new rubber on all six wheels.

I know the new trucks see better milage but the upgrade is $ 25K.
Reading the fourms I figure new truck will get about 18 crusing and maybe 10 to 12 towing. I know the new one will have more power and torque.

We use the truck for pulling our RV and sight seeing as we are retired.
Ok what are you thoughts on a New Ride

Thanks Wayne
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Old 08-22-2011, 07:52 PM   #2
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I just bought a 2007 F-350 dually with the 6.0 motor. The previous owner deleted the EGR system and replaced it with the Banks unit with the tall intake and exhaust pipes and added the 5 inch black cat exhaust system (around $4,000) . Around town I get 16 mpg. and on the hiway I get 19.5. Towing a 14,000 5iver (at 65) I get 13.5 - 14 mpg. Maybe you should look into changes instead of a new truck?
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Old 08-23-2011, 07:23 AM   #3
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Wayne,

My truck. with the exception of being a 450, is the same as ours and gets the same mpg's, I would surly like to improve it, but:

It is my understanding that the new trucks have an additional tank that requires a fluid to clean the exhaust system during re-gen. Not sure of the cost but it will eat into the 3/4 mpg gain, not to mention the pain in the pa-duff of maintaining it.

Be aware that modifying the system will void your warrantee and like bypassing / modifying catalytic converters is illegal and will not allow the vehicle to pass inspection in states where required.

Mike
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Old 08-23-2011, 09:08 AM   #4
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Your estimates on fuel mileage is pretty accurate for the 2011 SD. Consider SRW vs dually, 4x2 vs 4x4, and 3.30 vs 3.73 rear axle to improve fuel mileage even more (about 1/2 MPG each). Cleaning of the DEF is still the biggest fuel mileage killer (1/2-1 MPG). They are nice trucks, even with the XL trim level.
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Old 08-23-2011, 03:30 PM   #5
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Well I posted on about 6 fourms and most say they average 10 to 12 some less with the 6.7. That's towing so not much better than mine. Then as one guy said you have to buy DEF and that costs too. Well I'm thinking next year for the new truck I'll let the 6.7 engine Age a little.

We have about 23,000 miles planned for the truck and trailer by this time next year. We are rolling out to a southern trip for six weeks next month (Ohio, Georiga, Florida, Alabama, Kentucky) , then Texas for winter (4 months) and Alaska for next summer. Told the Boss Lady on the way home from Alaska we would stop to get a new truck. I got the Look !!
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Old 08-23-2011, 04:28 PM   #6
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Got my 2011, F350 4X4 last Nov. Presently have just over 7,300 miles. Trailer is an Excel that weight 3,050 on the pin and overall the weight is 14,800#.

I average about 11.5-12 mpg @ 60-65 mph towing and average 18 mpg on the highway @ 70. Have had as high 19.6 on rural roads and as a daily ride it can be all over the place depending on traffic, stop-go, weather or how I feel that day....in other words I haven't been able to figure out why it will vary from one tank to the next basically driving the same.

Overall I like the truck and have been pleased with the towing preformance and ride. Almost getting used to it as a daily ride. I have read other forums and have none of the problems others have reported. The DEF hasn't been much of a concern as first thought. Had over 5,000 miles when I checked the information center and stated it was at the half tank....put in 2.5 gals as we were going on a long trip and haven't thought about it since. I guess its all a relative thing and with all the requirements being put on the auto makers by the government....will only get worst before it gets better.
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Old 08-23-2011, 04:49 PM   #7
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Have you looked into a medium Duty? While expensive new they can be affordable used.
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Old 08-23-2011, 05:33 PM   #8
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2010 F350 Diesel dually Lariat ~1K on truck
This past weekend I went from Tunkhannock to Coudersport PA on Route 6. The speed limit ranges between 25 and 55 mph (goes through towns) with the majority being from 45-55. Towing a 12k 5er toyhauler I averaged just over 10 round trip (10.25 out 10Back and forth to work (12 miles each way, down hill then up) I average 15.
DEF; People are claiming 1K per gallon, at $10 per gallon (you can get cheaper) it is a penny per mile.
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Old 08-23-2011, 11:17 PM   #9
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Did the first oil change at 5000 mi., with 40% towing (2000 mi.) a 12K 5th wheel, it used 2.5 gal. of DEF.
2.5 gal. of DEF at O'Reilly's is $12.

My reference to DEF in a previous post was wrong, I actually meant the diesel exhaust particulate filter (DPF), Sorry used wrong acronym.
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Old 08-24-2011, 03:19 AM   #10
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Just my 2 cents worth. I have always been a Ford man and the last Ford I owned was a 7.3. Have heard so many bad stories about the 6.0 and the 6.4 and then the new DEF fluid that I thought I would try a 2011 Dodge 3500 fat boy. Really like the truck. I pull a 36 ft. Prairie Schooner and am getting 11 mpg. 16 to 18 cruisin down the highway. No DEF tank unless you buy a cab and chasis, puts it in a commercial class. Thanks
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Old 08-25-2011, 08:22 AM   #11
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Well I'm thinking next year for the new truck I'll let the 6.7 engine Age a little.

We have about 23,000 miles planned for the truck and trailer by this time next year. We are rolling out to a southern trip for six weeks next month (Ohio, Georiga, Florida, Alabama, Kentucky) , then Texas for winter (4 months) and Alaska for next summer. Told the Boss Lady on the way home from Alaska we would stop to get a new truck. I got the Look !!
I think I broke the Saleman Heart when I said we are waiting till next year.
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Old 10-22-2011, 07:02 PM   #12
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Well we finished the eastern trip on thursday. The truck did good no problems with truck just wish the mileage was better.
I was happy I bought a Pressure Pro Tire Monitor as the trailer got a flat. I changed the tire and noticed the tire was breaking down. The steel belts were coming out Goodyear Marathons.
Well today I looked for new tires but bought a new truck. Yep I bought a 2012 Ford dually with the 6.7 4 wd like the old one. Time to strip the extra tank and Pressure Pro. I have to start looking for a new hitch too.
Life is Good !!
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Old 11-26-2011, 01:53 PM   #13
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6.4 vs 6.7

My new F-450 came in, but I was unable to sell a new, unused tune...so I cancelled my purchase and installed the BlackMaxx...definitely not sorry. Is my mileage good? Heavens NO, but the interest on that $25K can put a Hell of a lot of "free" fuel in my 6.4)))))))
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Old 11-26-2011, 02:23 PM   #14
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I read this forum and I would love to buy a Truck.....I don't want the payment. I have a 1995 F-250 it has a little than 189,000 miles on it. I have not had a bit of trouble it's a 7.5L aka 460cid. I run 10/30w semi synthetic oil in it and never have to add a drop between oil changes. I get about 13miles to the gal. For the price of a new Truck I can put a lot of gouge fuel in it. (gasoline), also if the motor goes south on me I can put a new motor and transmission in it for a little less than $7500 bucks.

Sure they are sure pretty and nice and shiny looking but,(my truck) It's paid for.


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