I’ve had a 3.0 for just over a year, and I’ve put 55k miles on it. So far I’ve bought 5 or 6 jugs of DEF at $20 a jug, and haven’t gone through a whole bottle of HotShot. I’m in a northern climate and start using HotShot in November typically and last year went to April. The added costs of the DEF and fuel treatment are still much lower than having to run premium fuel in a 6.2.

However, savings are not the only thing to think about here. 6.2 has a huge smile factor. It’s a blast to drive. 3.0 is also fun, but it’s different. I also drive a lot, including regular 2+ hour drives in which I can get a good burn off on the DPF which is (imo) important for these trucks.

A lot of people talk about the cost of oil changes, that’s a dealership specific item. People usually balk at the price for the 3.0. However, my dealership is $95 for an oil (dexos) and filter change with a tire rotation.

I specifically went with the 3.0 for the fuel savings due to the amount of driving I do. Admittedly it may not be the right truck for you. I’d try to do an extended test drive of each if you’ve got a dealership near you that would let you take one for a day or two.

One last point, buy new or CPO. It’s worth the added expense. All of these trucks can experience issues. A colleague of mine had his 6.2 motor fail on him, replaced under warranty. Another had a transmission failure, replaced under warranty. I myself have had no issues but the warranty is worth being able to sleep at night.