Fuel Mileage - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 48 (permalink) Old 04-05-2007, 05:40 PM Thread Starter
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Fuel Mileage

How does the fuel mileage compare between the 6.7 and the 5.9? Does anyone have the 5.9 with 3.73 rear end and the auto tranny? What kind of mpg are you getting driving around 55 or 60 with the cruise set?
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post #2 of 48 (permalink) Old 04-06-2007, 02:02 AM
 
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When I drove one a few days ago the overhead was reading 17-18 and I believe it too because of how high the gears are and how the new fuel injection works. This was also a quad cab 4x4
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post #3 of 48 (permalink) Old 04-06-2007, 06:34 AM
 
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Fuel Mileage

Hello. This is my first post so I would like to tell to about my truck and how I broke it in and finally tell you what I get for mileage. I bought a new 2003 4x4 4 door 3500 auto diesel. I have right around 100K now. The first 10k I was very hard on it. I was living in Louisaina and the hurricanes caused massive flooding in my area. So to get through areas in was muddy to say it mildly. I redlined the motor numerous times to get through the flooded areas. Now I am back home in North Dakota. I now pull a 24' cattle trailer most of the time. At first my overhead was telling me I was getting 16-19 on the highway going 70. I put a fixed 100hp edge chip, magnum cold air intake, and 5 inch exhaust on the truck at 18,000 miles. My mileage went to 21-23 on the overhead. A couple of years later and 60,000 more miles I started adding 3oz. of acetone per 10 gallons of fuel. My overhead now reads 32-35 on the highway going 70 with the cruise set. Hard to believe I did the math and it is very close. I am getting 31.2 miles per gallon. Believe it or not. Thinking aobut buying a new one and breaking it in the same way to see what happens.
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post #4 of 48 (permalink) Old 04-06-2007, 01:03 PM
 
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Man that is very hard to believe,
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post #5 of 48 (permalink) Old 04-06-2007, 05:40 PM
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Quote:
Originally Posted by DNRCustoms
Man that is very hard to believe,
VERY hard to believe.

31+ MPG with a 100HP chip. I'd be shocked to see someone get 21 MPG with a 100HP chip.......but 31 MPG.......???
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post #6 of 48 (permalink) Old 04-06-2007, 09:04 PM
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I have had 5 - cummins 95 - 03 - 2 - Powerstrokes - drove everyone hard right from off the lot - my 03 dodge was about the best maybe hit 23 mpg cdn. My 06 F350 6.0 L - 17 mpg max, my 08 6.4 L 14 mpg max on the hwy - not good - also buying a 07 6.7 L cummins 6 spd auto mega cab 4x4 for a second vehicle - hope it does better than my 6.4 L

So 30 + mpg :bow: - I dont think thats possible.
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post #7 of 48 (permalink) Old 04-06-2007, 09:18 PM
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The Gen 1 Cummins got the best mileage of ANY diesel, that was 26 MPG with a M/T and low # gears.

given that most people report getting lower than 17 MPG with the 6.7L, I think you had better be quiet about this or Cummins will come take it back just to figure out what went wrong with it.

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post #8 of 48 (permalink) Old 04-06-2007, 09:52 PM
 
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I can get about 25-27 Highway only driving. My injection pump is bad and I get about 15 MPG City, 24 Highway NOW. My truck tips the scalls at 6,000, it's a 2wd and it sits even lower to the ground then usual, intake and exhaust, sythetic oil in everything. Lightest cummins out there.

Acetone................. your guarnteed to blow up your engine. Your overhead is reading wrong, and you most likely are messing up your numbers.
The only Cummins that could probably do 30MPG is a 2001 or 2002 H.O. 2wd.
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post #9 of 48 (permalink) Old 04-06-2007, 11:35 PM
 
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Quote:
Originally Posted by Phily 911
I can get about 25-27 Highway only driving. My injection pump is bad and I get about 15 MPG City, 24 Highway NOW. My truck tips the scalls at 6,000, it's a 2wd and it sits even lower to the ground then usual, intake and exhaust, sythetic oil in everything. Lightest cummins out there.

Acetone................. your guarnteed to blow up your engine. Your overhead is reading wrong, and you most likely are messing up your numbers.
The only Cummins that could probably do 30MPG is a 2001 or 2002 H.O. 2wd.
That is what I thought, isn't acetone for like prepping for paint or like a potent cleaner. Definately never heard of it as a fuel additive. Maybe he made some new discovery that nobady has ever tried. I would try it if I got like 10 mpg better. I would like to somehow see proof of this 30+ mpg, and I'm sure others would to. I hate to burst this guys bubble, on one of his first posts, but it just doesn't make sense.......:shrug:
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post #10 of 48 (permalink) Old 04-06-2007, 11:42 PM
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Acetone was all over the 'net last year when gas spiked way up in price.

They CLAIM is improves combustion, efficiency, atomization, blah blah blah...

Both real-world and labaratory testing DISproved the "theory" about a million different times.....

But, some people will still claim it works.

Sorta like gas pills.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
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