On fuel efficiency, real world the difference is 2-3 mpg.
On maintenance, you still have to change the cummins every 6mos. Oil and filter $40-50. Then add in the price to change both fuel filters every 15k.
Now add in the price of DEF. It isn't a lot, but it isn't free either. Plus you use it a lot faster when towing. Ever been in the middle of nowhere and looked at the price of a jug of DEF? I've seen $8 per gallon. Yikes. Not to mention it has a shelf life. You will, at some time or another, get a check engine light triggered by weak DEF. Might want to get a code reader if you don't have one already.
Now if something does break or fails and it's not under warranty, look out.
The diesel is big power, big money. You gotta pay to play.
As said earlier, put the pencil to the paper. You may never truly realize a financial gain from diesel ownership. It's true they have higher resale, but if going with another diesel with another 7-9k markup, does that resale gain much?
Now I know somebody might take offense to this post and call me biased. Let me address that as I had a 2015 2500 6.4l with 3.73 gears. The only problem with it was i should have opted for 4.10 gears. All I ever did was change oil at about $55 per change. My TH I later bought was maxing out my GCWR as we slowly stuffed it with more and more stuff so I went to a 2013 3500 6.7 about 2 months ago. It had been on the lot while so it was priced to move, and I got a fair trade in. So far 2 C.E.L. from DEF purchased from the pump at a high volume truck stop(P20EE). Real world MPG gain of 2mpg empty or loaded with my driving style. And a $215 oil/filter, air filter, and both fuel filters change done by me. Ive also had to replace the upper radiator hose $280, its a poor design if you ask me. Luckily I opted for MaxCare and it was covered with $100 deductible. Now the benifits are when towing I can go about 250 miles vs 200 before I have to fuel. It does pull the hills better, but I can say a 6.7l pulling a pass at 2400 Rpm isn't any less noisy than the Hemi at 4200. The 6.4 did a good job holding back the load going down using engine braking, but the exhaust brake on the 6.7l is great.
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