@mcgaskins - are you still getting +2 MPG?
If so, what do you attribute it to?
I love the idea of it and im sure it makes the car feel snappier, but having a hard time wrapping my head around a difference in MPG from a device that merely controls throttle engagement points.
What am i missing?
I have been seeing the same 2 mpg increase halfway through the third tank. I have a few thoughts as to why this is happening, and all are just my opinion/theory.
I drive relatively fast, and, before the PC, the transmission mapping combined with with the throttle response required me to essentially floor the gas pedal several times a day to maneuver how I wanted in traffic. It did not respond in a linear way to my throttle inputs, then by flooring it the car “overreacted” and responded too aggressively. The PC makes the truck respond in a far more linear and controlled way and requires far less depressing of the gas pedal, so it’s helping move the truck along more efficiently. I have issues with the tendons in my lower leg, and the effort reduction in using the gas pedal has gone down tremendously to the point it has caused my discomfort to go down as well.
Another interesting feature is that by running in sport +3 I’ve been able to not run in the power mode on the transmission which causes the Eco light to be on most of the time now as opposed to never before. I have no idea what that means, but it could segue into my next theory: Perhaps the strongest impact comes from the fact I’ve been hyper aware of my driving style and mpg lately. When I see the eco light come on, I try to keep it on and have been more conscientious about how aggressively I’m stepping on the gas.
When it’s all said and done, this is intended to help people want to sharpen up their throttle response. I wouldn’t buy it for mpg alone, and I’m not trying to sell it as such. I’m not trying to sell it at all actually, though in hindsight I should have done a promo code and got a cut from PC.

I also really don’t care if people believe my experiences.If you buy it and didn’t like the results you got, you can always return it, or of course you can just avoid buying in the first place.