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07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 10-07-2011, 09:23 PM   #1 (permalink)
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Best way to increase mpg

I have a 2008 Dodge Ram 2500hd with a 6.7 cummins. I am looking for better fuel milage when towing our 10,000# 5th wheel.
Any suggestions?
What is the best chip for this application?
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Old 10-07-2011, 09:28 PM   #2 (permalink)
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lol your towing 10 thousand pounds fuel mileage goes out the window. maybe a banks fuel economy tuner (im not sure what its called) would help you slightly but your not going to be getting good fuel mileage either way you split it. im sure you drive alot of hwy with your load and thats probably the biggest factor in getting better fuel mileage, it is what it is
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Old 10-08-2011, 12:58 AM   #3 (permalink)
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Suggest you keep your speed at 60mph or less. 65 or over and your mileage will drop like a rock, especially while towing.
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Old 10-08-2011, 01:13 AM   #4 (permalink)
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Get rid of your emissions stuff and buy a decent programmer like a smarty or H&S. Let it breath better by a decent intake and get rid of your factory exhaust, its very restrictive. Especially in the downpipe and all the filters.
I run 37" tires and can get 20-21mpg. It drops to around 15 pulling my 12000lb travel trailer.
It all depends on how you drive and programing helps big time...
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Old 10-08-2011, 01:22 AM   #5 (permalink)
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Yes, you can always do the deletes and get a tuner, but you need to consider the cost vs. reward. Doing mods PURELY for MPG gains takes quite a while before the cost of the mods is recovered in fuel savings.

My truck gets 11.5-12mpg towing an 8000lb travel trailer. At $4.02/gal (current price), that's $0.342/mi. If the tuner+deletes brought that up to 14mpg then that would be $0.287/mi, a savings of $0.055/mi. If the tuner and delete pipe (Cheapest option) cost $800, then saving $0.055/mi it will take 14,500 miles to reach the break-even point.

If my freeway mileage were to go from 18mpg to 20mpg, a savings of $0.022/mi, it would take 36,000 miles before I broke even on the mod.

So yes, doing the deletes ONLY for increased fuel economy will eventually pay for itself if you drive enough.

I find just slowing down is the cheapest way to save money on fuel. I'll be doing the deletes, but not only for fuel economy gains.
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Old 10-08-2011, 01:28 AM   #6 (permalink)
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Depends on how long you plan on owning the truck. If you plan to keep it for any length of time the mods definately pay out in the end not in just fuel saving but longevity of the engine and components as well.
A programer will adjust the timing curve and make the engine run much more efficiently, the deletes will stop the engine from recirculating exhaust gas back into your intake and carboning up your whole system. It will save in turbos as well as their is less carbon running through the engine.
If you are going to get rid of it in a few years, just buy a programer that will shut off the emissions and make yourself up some block off plates, won't cost you much at all.
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Old 10-08-2011, 01:33 AM   #7 (permalink)
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My 2005 Dodge 5.9 averaged almost 13mpg during our 7500 mile summer towing our 13500 lb fifth wheel. Our 2008 Dodge 6.7 gets almost 3mpg less than the 2005 5.9 and I think the main difference is the BlueTec emissions stuff. Just a thought.
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Old 10-08-2011, 01:35 AM   #8 (permalink)
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Quote:
Originally Posted by DQL View Post
My 2005 Dodge 5.9 averaged almost 13mpg during our 7500 mile summer towing our 13500 lb fifth wheel. Our 2008 Dodge 6.7 gets almost 3mpg less than the 2005 5.9 and I think the main difference is the BlueTec emissions stuff. Just a thought.
That is correct and also the reason that emmision stuff "falls off" of so many trucks.
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Old 10-08-2011, 08:50 AM   #9 (permalink)
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Quote:
Originally Posted by Yahooligan View Post
Yes, you can always do the deletes and get a tuner, but you need to consider the cost vs. reward. Doing mods PURELY for MPG gains takes quite a while before the cost of the mods is recovered in fuel savings.

My truck gets 11.5-12mpg towing an 8000lb travel trailer. At $4.02/gal (current price), that's $0.342/mi. If the tuner+deletes brought that up to 14mpg then that would be $0.287/mi, a savings of $0.055/mi. If the tuner and delete pipe (Cheapest option) cost $800, then saving $0.055/mi it will take 14,500 miles to reach the break-even point.

If my freeway mileage were to go from 18mpg to 20mpg, a savings of $0.022/mi, it would take 36,000 miles before I broke even on the mod.

So yes, doing the deletes ONLY for increased fuel economy will eventually pay for itself if you drive enough.

I find just slowing down is the cheapest way to save money on fuel. I'll be doing the deletes, but not only for fuel economy gains.


It only cost me $445.xx for a mini maxx and delete kit. You can cash the old exhaust in. I gained 5mpg loaded or empty. It wont take long to pay off. But, I still dont see 20+. I probably drive too fast.
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Old 10-08-2011, 06:28 PM   #10 (permalink)
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You can start by unplugging your egr and ignore the cel.
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Old 10-14-2011, 01:40 PM   #11 (permalink)
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Do the deletes you will not regret it. I did the deletes with the Smarty JR and gained an honest 5.5 mpg.
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Old 10-14-2011, 10:14 PM   #12 (permalink)
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Do the deletes you will not regret it. I did the deletes with the Smarty JR and gained an honest 5.5 mpg.
Is that US or Imperial MPG? I can see 2-3mpg US, the only way I can believe 5.5 is if you're in Canada.
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