I have been reading bits and pieces about how the common rail engines have this so called “internal EGR” due to the way the camshaft is ground.

People say this is one of the reasons the newer trucks don’t get the same MPG as the old.

I can attest that my 1995 1-ton dually with the 12v and NV4500 would get as high as 20 mpg and 22 mpg if I kept the speed below 60 mph.

With my 2004.5 3/4 ton 4x4 auto I have never been able to get the MPG into the 20’s no matter how I drive it.

Have any of you swapped cams in a 3^rd gen CR engine to try and gain back some of the performance and MPG that is lost due to this polluting the cylinder with exhaust?

And if so what else will need to be done to make the computer / truck / engine all live happy together?

Thanks!

I went with a Colt Cams Stage 1 cam and like it. It made the bottom end smoother/stronger and definitely flows more air across the board. I didn't see a huge mileage gain with it, but my mileage is pretty decent for how I use the truck. I have only broke 20 once, but don't get to drive in manner that would allow me to very often. The 3rd gen 5.9 grind has the largest intake profile and smallest exhaust profile of any ISB cam in a Dodge. That means low airflow, and lots of exhaust left in the cylinder.Hamilton has come out with some new grinds since I bought my cam and I am not sure how they work for mileage. The computer will not ever be the wiser, but with a stock turbo I wouldn't expect much gains above a stage 1. The stock turbo is just too restrictive, and more airflow creates more back pressure and boost.

Hey Apache,I called Hamilton Cam's, nice people and not afraid to talk to you about what you want to do with the truck.Went with the 188 / 220, 109.25 LSA, .310" / .320" cam.After doing a google search on BB Turbo's I noticed you have installed a Garrett PowerMax.I would love to talk to you about it to see if you are still happy and any advice you could pass along would be great!If you dont feel like typing a bunch of stuff I can PM you my Phone number or if you like maybe we should start a new thread aboout it? Just let me know what works best for you.Thanks

That's a big cam!Yeah I love my Garrett, great turbo. Send me a PM.

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wtf is this???

wtf is this???

I regularly get in the 20mpg range now. Smarty helped that a lot, but the SpynTec free spin manual front hub kit helped more.About 520 miles on this tank now and I'm just starting to touch the 1/4 tank line on the fuel gauge.