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Old 12-02-2018, 02:33 PM   #101
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Drove a 2013 2500 4x4 Ram w the Cummins for 4 years and 50K miles towing a 7500 TT.
Never got worse than 10 mpg or better than 12 mpg towing. Never drove faster than 65 mph.
Numbers based on actual calcs. Display mileage made me feel good but was lying to me.
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Old 12-02-2018, 10:17 PM   #102
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Either way everyone can split hairs on every possible cause it is still clear when the dealer flash my computer me and my friends with the same truck lost 3mpg. Doesn't matter what part is involved.
My personal experience with a different vehicle supports your conclusion. I had a 2013 ecoboost f-150 I bought new and was told by FO MO CO that I had to have a flash done for emission reasons or they would void my factory warranty. I searched for this particular flash and several people said they saw a decrease in MPG and also a decrease in performance. I asked my dealer if I suddenly wasn't getting the MPG's or performance I paid for, what repercussions did I have, the answer.. Nothing. In short I had the flash done, and to be honest I personally got better mileage and performance after the flash.. Obviously I cannot discount the folks that had a subpar performance after the flash with my experience, but I can say that, it must just vary. Some vehicles seem to react differently than others, when they should be exactly the same..
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Old 12-03-2018, 09:20 AM   #103
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Originally Posted by koller1509 View Post
Fuel goes in the DPF not SCR!!! def goes in SCR. That article was written by ambulance chasing lawyers who don't know the difference between a DPF and a SCR. As I stated earlier, I have had all recalls done and no change in mileage. Even if they changed the burn rate for diesel in the DPF you would only notice it when it was in regen.
X2 I have had all recalls done also no change in mileage for me
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Old 12-03-2018, 12:27 PM   #104
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Either way everyone can split hairs on every possible cause it is still clear when the dealer flash my computer me and my friends with the same truck lost 3mpg. Doesn't matter what part is involved.

Did you all take your trucks to the same dealer? If so, then maybe they're using an outdated or wrong "flash" program. We as consumers never know don't have access to the different programs dealers get to program, tune, de-tune, repair glitches, patches etc. so, we're at their mercy and are hoping we're getting the right fix!
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Old 03-11-2019, 02:00 PM   #105
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I have had my 2013 Ram Cummins flashed 3 times during recalls. Same Milage, Same Performance.. 24 on the highway at 70. 12.5 pulling my Columbus 340k.
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Old 03-11-2019, 02:39 PM   #106
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I have had my 2013 Ram Cummins flashed 3 times during recalls. Same Milage, Same Performance.. 24 on the highway at 70. 12.5 pulling my Columbus 340k.
I'd wonder about that flash. I got 25.5 @70 with my 2012.
13.5 towing my 5er.
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Old 03-11-2019, 02:49 PM   #107
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2017 Ram Crew Cab 4x4 6.7 3.42 rear end.
19 mpg if I dont push it
13-14 mpg with a 25ft TT around 6k.
The truck is not deleted
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Old 03-11-2019, 03:18 PM   #108
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Lightbulb Welcome to SDE - Software defined Everything

The various software and firmware flashes may or may not have an effect on fuel economy... funny how we are talking about a >7,000# truck pulling a trailer (or not) and fuel economy. I have seen numerous posts asking whether Ford, GM, or Ram (some call them "Dodge"... maybe referring to the pre-Ram models) has the best fuel economy. My experience is they achieve within one MPG or so between them.

Beyond that, there are so many other factors... outside air temperature, fuel quality/brand/mixture, additives, tires and tire pressure, etc., and others too numerous to mention.
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Old 03-11-2019, 05:12 PM   #109
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Found a deal we couldn't pass up. Demo pricing due to 1900 miles.
2018 2500 hemi 4x4
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