nlambert182
Senior Member
- Joined
- Dec 28, 2022
- Posts
- 898
- Reaction score
- 1,244
- Location
- Huntsville, AL
- Ram Year
- 2018
- Engine
- 6.7 Cummins
I check it manually. My EVIC shows better economy than that.So not sure how you're calculating your gas mileage. I do see you have the Diesel, which is a whole other subject.
I am checking all my potential truck purchases on Fuelly.com (multiple owners report their combined gas mileage).
For the V8 6.6 Gas, it is showing 12.6 MPG
For the V8 6.6 Diesel, it is showing 14.1 MPG (current model)
For your 2018 Diesel (which shows 6.6 and not 6.7 like your profile), it is showing 13.3 MPG.
Compared to the V8 5.7, it is showing 17.4 for the current model. Which is also the best gas mileage compared to all half tons that are gas (not hybrid or diesel). This is also one of the reasons I started looking at the RAM 1500. So I trust those figures more than you claiming 18.5/23. Unless I'm missing something with your info?
So for a new truck, 1500 vs. 2500, the 1500 gets almost 5 MPG more (4.8). So that is significant and would definitely be a deal breaker for the 2500 in my situation. I could probably handle a little rougher ride if the numbers were a little closer.
I hand calculate my mileage and that's the real world number that I go by. Lots of folks with the 2500/6.7 combo have reported similar. The 3.42 gearing in my probably helps my mileage. My 2016 Ram didn't get nearly as good, at 16.5mpg empty. I can tell you that I have never owned a diesel that got 13.3 mpg.
A Cummins is a 6.7 diesel and has been since 2007. Prior to 2007 it was a 5.9. The gas engine in a 2500 is a 6.4L. Prior to 2014 it was a 5.7. There has never been a 6.6 Cummins or 6.6 Hemi. Further, there has never been a V8 cummins in a truck except for the 5.0 V8 Cummins that Nissan stuck in their Titan XD. a Cummins is an inline 6.
A 6.6 is a Duramax. If fuelly shows a 6.6 that in itself is enough to question the validity of the data provided.
Since fuel mileage seems to be your biggest factor I still stand by that a properly equipped 2500 will outperform similar 1500s in fuel mileage when empty and towing. I've gone to great lengths to do the math on these for myself and considering my real world numbers. There is a 3 mpg difference between my 1500 and my 2500. Once towing, that gap widens significantly.
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