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Old 11-06-2013, 03:17 PM   #15
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I suspect your lower mpg could be related to the 3.55 gearing and 20" wheels. At 4k lbs, you're towing relatively light, but with your gearing and wheels, you may be lugging your engine.
A friend of mine with a Cummins did show an increase in mpg after about 35,000 miles. I've never seen any increase with mileage in any of my Duramaxes or heard of the same with Ford diesels.
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Old 11-06-2013, 06:07 PM   #16
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Not sure of the other makes, but the Ford 6.7L has several adaptives that need to be "learned" by the PCM. There is turbo control adaptive, EGR, and injector adaptives. I have no idea on the total time these adaptives fully "learn" but may also account for some better MPG after some miles on the truck. When a repair to the fuel system, EGR, or turbo is completed, many times that specific "adaptive" needs to be cleared so the PCM can start the process again.
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Old 11-07-2013, 06:05 PM   #17
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I normally get 11 towing a 32ft TT with my 2007 Duramax. When I towed my buddy's 22ft TT empty to and from Atlanta, (roughly 200 miles R/T) I still got 11. I've said before that 10 -12 mpg towing with a diesel is about par.
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Old 11-07-2013, 06:30 PM   #18
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I have the brother of the Power Stroke, the Maxxforce7.

Cant really tell much on the MPG cuz we dont repeat many roads. But it seems better.

However, the torque improvement has been incredible! I could feel the additional torque during accelleration and passing. At about 10,000 a long 6% grade was crested at about 35 mph, at about 15,000 and 20,000 and 25,000 it had improved about 4 mph at each juncture.
Gotta love it.
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Old 11-07-2013, 10:45 PM   #19
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Alrighty then..My 12.5 for my light rig is normal and may or may not improve slightly with time.
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Old 11-07-2013, 11:01 PM   #20
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Trailering at 62 have about 1300 rpm.where i get 12.5 mpg. Engine sounds good not lugging in 6 gear.
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Old 11-08-2013, 02:01 AM   #21
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Just when I got my `97 Ram CTD broken in, they changed to lo-sulfur diesel and my mileage went from ~10 to ~9 when pulling my 12.1K, 33' 5er..
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Old 11-18-2013, 09:50 PM   #22
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I once owned a 96 Dodge CTD. That 5.9 Cummins always used a quart of oil very 1,000 miles. On one trip we were driving from Barstow to Las Vegas on the interstate, air temp. was near 100, for an unknown reason traffic was bumper-to-bumper @ 10-15 MPH climbing that 16 mile grade. My engine temp. began to climb to the red-line so I pulled into an Indian market to allow the engine to cool and look around. After the engine had idled for about 15-20 minutes we pulled onto the interstate again, never had the overheating again.
When we returned home I asked my son-in-law (maintenance manager for a trucking firm) why my engine stopped using oil after that overheating. He said that caused the rings to finally seat, the engine hadn't been worked hard enough until then. OH, that was at 84,xxx miles. Made sense to me.
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