MPG vs new trucks - Dodge Cummins Diesel Forum
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post #1 of 28 (permalink) Old 10-08-2019, 02:32 PM Thread Starter
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MPG vs new trucks

Just wondering why the new trucks with more power and more emissions seem to be more fuel efficient than the good ole 5.9?

I have a 2006 with slightly over sized tires (about 32" BFG AT KO's), drive the speed limt and the best I have ever gotten is about 18/19mpg on the highway.

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post #2 of 28 (permalink) Old 10-08-2019, 02:37 PM
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transmission, tuning, gearing.

4 speed vs 6 speed with a double overdrive

while they do have more power, it's rarely used. tuning prevents heavy use of the power most of the time and most of the power just isn't needed 90% of the time. The tuning is optimized for fuel economy

3.42 gears on alot of the newer trucks, i think the 19s are getting 3.73s again. meanwhile 3rd gens usually have 4.10s and 3.73s IIRC
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post #3 of 28 (permalink) Old 10-08-2019, 02:43 PM
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My 2016 completely stock gets 15-16mpg with the cruise set on 70.

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post #4 of 28 (permalink) Old 10-08-2019, 03:11 PM
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my 5.9 gets 16 to 25 mpg cruises 75 @ 1700 rpms.

03 QCLB- 19 to 25 mpg with electric parts, and engine mods....
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post #5 of 28 (permalink) Old 10-08-2019, 07:30 PM
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My 05 gets 16-22. Less if Iím pulling the horse or camp trailers.

2005 QCSB, cold air intake, guages, a trans built by me and HPTuners tunes by me
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post #6 of 28 (permalink) Old 10-08-2019, 07:31 PM
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Originally Posted by 4everlearning View Post
My 05 gets 16-22. Less if Iím pulling the horse or camp trailers.
you mean to tell me with the added horse power in the trailer you don't get more?
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post #7 of 28 (permalink) Old 10-08-2019, 07:58 PM
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you mean to tell me with the added horse power in the trailer you don't get more?


I know, itís shocking isnít it.
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post #8 of 28 (permalink) Old 10-08-2019, 08:19 PM
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These old trucks can get just as good or better fuel mileage then the new ones....
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post #9 of 28 (permalink) Old 10-08-2019, 08:30 PM
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o2 sensors... better control over the injection mix

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post #10 of 28 (permalink) Old 10-08-2019, 08:40 PM
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My 04.5 is averaging 17.5 unloaded mixed driving and I averaged 14.5 mpg towing about 7000 lbs all highway for 1700 miles recently. All hand calculated figures. Freshly rebuilt engine, new clutch and new injectors right before this mileage calculation took place.

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post #11 of 28 (permalink) Old 10-08-2019, 09:05 PM
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My last tank was just under 16mpg hand jammed. That’s unloaded mixed highway/city with 37s, 100% over injectors, and a jackass behind the wheel. Oh and I have a few fairly significant fuel leaks I’m in the process of fixing. I think with a little more maintenance (previous owner did absolutely zero it seems) I can get close to 19 or 20.

2006 2500 Mega Cab - Currently a basket case in progress
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post #12 of 28 (permalink) Old 10-08-2019, 10:23 PM Thread Starter
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Quote:
Originally Posted by steve05ram360 View Post
o2 sensors... better control over the injection mix
Has to be something like that as well as more transmission gears and numerically lower rear end gears.

Thanks.
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