Forum Discussion
ib516
Feb 18, 2015Explorer II
Buck50HD wrote:
In the last 5 months, I don't think I've driven my truck in any conditions where the cylinder deactivation would even come remotely close to activating. But, I don't haul groceries or commute with it. I also have not seen a direct comparison where there has been any significant difference in mileage between the 3. In fact, the 6.4 was consistently the worst in the PUT.com shootout. My 2004 2500HD 6 liter got the same mileage. There's a lot raving about the Ram mileage but I still have a hard time buying it.
I had a GM 5.3 with cyl deactivation and the only thing it did was cause stuck lifters on a cold start and sounded like it was coming apart. The mileage was no different than previous non-AFM 5.3's I owned. It was used to pass emission tests, not save fuel for the owner.
3/4-ton Shootout Fuel Economy
You must drive in some extreme conditions then. Once up to operating temp, the 4 cyl mode cuts in all the time on my truck - everyday in fact, several times in a 8 mile commute. It kicks in when city driving as soon as I'm up to speed. On the hwy, as long as there is no wind and no hills, it's in 4 cyl mode. As soon as there's an uphill grade on the hwy, it kicks into 8 cyl mode, and it doesn't take much of a slope. That said, here's a video of my hwy mpg. Why not post your hwy mpg? Surely, your 3.73s would have the advantage.
Here's a video of my truck's hwy mpg
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