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Old 02-01-2010, 07:33 PM   #15
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19 mpg - 21 mpg on highway empty

average 14 mpg with 28'

should have bought a Dodge
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Old 02-01-2010, 07:47 PM   #16
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Quote:
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19 mpg - 21 mpg on highway empty

average 14 mpg with 28'

should have bought a Dodge
What is wrong with those numbers? They look OK to me.
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Old 02-01-2010, 08:03 PM   #17
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The new 2011 Ford Superduty 6.7L is scheduled to start production 2/15 and I believe it will be a winner in the fuel mileage. The engineers have reported 22-25 mpg. The engine uses urea to rid the exhaust of the soot in the DPF. They have dyno results of 500 hp and 1100 foot pounds torque of course Ford has lowered these numbers for the production units.
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Old 02-01-2010, 08:07 PM   #18
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Btw these mlelage results are due in part to the 331 rearend they are putting in them. It use to be a 355 which was the lowest gearing you could get.
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Old 02-01-2010, 08:45 PM   #19
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I have a 2006 Chevy 3500 C-C with 38k miles (bought it new) and had thought about getting a 2010 Chevy 3500 when they came out, but with what I have read and heard about the 2007 and post diesels, it looks like I am better off just to keep what I have...
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Old 02-01-2010, 09:04 PM   #20
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Any diesel that has any emissions crap on it, i.e.: DPF, EGR or Catalytic Converter, will get worse mileage than a non-emissions diesel. My 2001 3500 CTD with 4.10's got 21MPG consistently, until the VP44 started crapping out. My 2005 2500HD CTD with 3.73's and a cat got 21MPG, until ULSD came out; then I got 17MPG...best I could do. My 2004 F350 King Ranch with 4.10's, cat and EGR gets around 12MPG.... these figures are all MPG's when not towing; the Dodges got around 14MPG towing and the King Ranch gets around 10MPG. I also have a 1400lb Herrin Hauler bed on the King Ranch. I've always kept my trucks at 2000RPM, the supposed sweet spot for diesel engines.

There's no doubt that a P-pumped 12v Cummins will get the best mileage; you'll also be killing Mother Nature, according to the nature kooks, but I'm pretty sure that Mother Nature will still be around and able to regenerate itself, long after we've gone the way of the dinosaur...my opinion, of course. Then again, if the Earth can survive massive meteor strikes and super volcanoes, I don't think that diesel soot is going to faze it one bit.
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Old 02-01-2010, 09:06 PM   #21
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Quote:
Originally Posted by lsmith View Post
19 mpg - 21 mpg on highway empty

average 14 mpg with 28'

should have bought a Dodge
I actually considered one, but couldn't stand the ride.
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Old 02-01-2010, 11:25 PM   #22
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Yup, the HP got too high to support great fuel mileage. 2WD and the man trans are the other key components. (As well as highway rib tires).

The driver makes the biggest difference afterwards. For big trucks, all else identical, the spread between drivers is 30% in fuel mileage. Changes in speed and use of the brake kill mpg. City traffic flow is 15 mph, nationwide. If one logs highway elapsed times, one learns that traveling below the limit increases the time of "steady state". In both instances one learns to never come to a stop, use the brakes or change lanes. And THAT changes all other habits.

Whatever the vehicle, one can improve on initial numbers. 10-mph under the limit on the highway/5-mph under in town is the place to start.
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Old 02-02-2010, 02:17 AM   #23
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Steve, pretty much all the '08 and newer diesels will have sucky mileage because of the particulate filter.
Our 2009 Jetta turbo diesel gets 40+ mpg on the freeway, and still does 0-60 in just under 8 seconds. It's subject to some pretty tough emission standards.

I think mileage on next gen trucks will improve as they get things sorted out. The current generation of trucks was designed for low fuel prices.

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Old 02-02-2010, 08:04 AM   #24
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We have a 97 VW Jetta Diesel. It has dropped about 3 mpg since ULSD fuel was introduced. I keep additives in the fuel tank but that only seems to help with the amount of smoke. I am down to 42 mpg in town, 46 on highway.
Recently I have had to gut the catalyst on this car. It finally plugged up after 175K. It took quite a bit of diagnosis to find the problem. With all the computer control and sensors these are not easy cars to work on.
From all of my reading it seems that all new diesel trucks are suffering from the same poor mileage trouble. It seems that the displacement had to increase to make up for the emissions equipment which robbed the engine of power which in turn would use more fuel.
STEVEH I think your right in the ballpark with the fuel mileage of your 08 Duramax. Newer trucks just are not as efficient.
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Old 02-02-2010, 11:04 AM   #25
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Newer trucks just are not as efficient.
This is difficult to prove w/o a standardized test for fuel mileage. I suggest that it's high time the manufacturers provided mileage data for our trucks. That way you could weigh the advantages of that extra 75 ft-lbs of torque against the 2 mpg difference while towing, for example.

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Old 02-02-2010, 01:30 PM   #26
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Of course, we're currently running winter fuel, which has lower BTU content, but on my '09 GMC Duramax, I get pretty much regular 20-21 mpg running empty at 65-70 mph. on long trips. Worse in town, of course, trying to accelerate all that mass. Am currently a towing trip and first 750 miles averaged 13.4 towing at 65-70. I am not complaining. Like the torque and control!
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Old 02-02-2010, 02:57 PM   #27
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Nature kooks?

Quote:
Originally Posted by StingrayL82 View Post
There's no doubt that a P-pumped 12v Cummins will get the best mileage; you'll also be killing Mother Nature, according to the nature kooks, but I'm pretty sure that Mother Nature will still be around and able to regenerate itself, long after we've gone the way of the dinosaur...my opinion, of course. Then again, if the Earth can survive massive meteor strikes and super volcanoes, I don't think that diesel soot is going to faze it one bit.
Not to hijack this thread, but I guess you don't like to fish, hunt or think too much about the millions of Americans with respiratory problems made worse by diesel particulates (just take a look at San Pedro, CA: much higher rates of lung ailments because of ship-generated diesel exhaust). Sure, the planet won't disappear, just the life it supports. I like the idea of cleaner diesel, and I'm not convinced that science and engineers have exhausted their ability to produce both powerful engines that also spew less poison. Like you said, just my opinion!
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Old 02-09-2010, 07:42 PM   #28
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Not to hijack this thread, but I guess you don't like to fish, hunt or think too much about the millions of Americans with respiratory problems made worse by diesel particulates (just take a look at San Pedro, CA: much higher rates of lung ailments because of ship-generated diesel exhaust). Sure, the planet won't disappear, just the life it supports. I like the idea of cleaner diesel, and I'm not convinced that science and engineers have exhausted their ability to produce both powerful engines that also spew less poison. Like you said, just my opinion!
Well, actually I do like to fish and hunt, and I have COPD, thanks to my father who smoked in the house and in the car, with the windows up, as well as all the crap I breathed in, when I was in Kosovo. Did I mention I'm only 36? Advair tastes like crap, by the way. What does that have to do with diesels and the mileage they get because of their emissions components?
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