I just wanting to know if anybody has got one of these with the 6.4L.
Bought mine last February getting 11-13 MPG and have since tried many tunes
Heres what i have come up with

Superchip cortex- terrible, no fuel gain and not much power 13-15MPG
Banks six gun- terrible fuel, very little power 11-13MPG
SCT livewire with innovative tunes- lots of smoke and power but poor milage11-13 MPG
KEM Custom tune on H&S Mini Max- Loads of power and excellent fuel mileage 18-20

I put my truck on the dyno and it came out with 636hp and unbelievable torque with the KEM tune. Its milage is unbelievable 17-18 here in Clemson and 20-22 on the interstate pulling a small boat, and thats with 37" trail grapplers. Somehow every time i push the gas it pours out smoke, but hey it gets better milage than the ones that don't smoke.

I was just looking to get some feedback on some other peoples experiences and share a few of my own.