I liked the engine just fine in the 1500. Most of the time it was completely unobtrusive and while not 3.5L Ecoboost fast, it had ample power. What I found annoying was the vibration at exactly 55MPH. It was then that I wished for the smoothness of a V8. As 2 cylinder mode just shook the truck and had me either downshifting or speeding up to 65MPH.
Since I was doing a long road trip on rural single lane (each side) highways, 55 was the speed to go, and cops were everywhere. It became frustrating.
MPG was good at 18 on reg and 19 on premium. Although I was going slow, the 2.7 Ecoboost achieves 21 on the same trip.