I know it would clutter up the thread, but it is obvious that driving style makes a big difference. I would love to know what people were driving before and what kind of mileage did they see in that. For instance, if they were driving a FS pickup and were getting 7 MPG with the 4.3L and now they are getting 23 MPG with the diesel twin, then the improvement is tremendous. However, if they were driving that same FS pickup with 4.3L and were getting 19 MPG, then not so good.
The real numbers that will help us understand the diesel will be after they hit a 1000 miles on truck, the transmission has learned the driver, and the engine is broken in a bit. Couple that data with some subjective comments about how well the transmission handles the complaints the gas owners have had with shifting would really tell me what I want to know.
It may make a for a tough decision on my part, but like SavageBob, my main focus is to see if I would want to replace my V6 with a diesel in the future. Not next year, but by 2019/2020. Granted, by then we should have 8/10 speed transmissions to factor into the decision.
And to some degree, I don't care that there are differences in summer/winter blends of fuel. Last I checked, I drive my truck year round. Can't park it for a few months of extreme hot/cold weather a year.
2015 Canyon SLT, Copper Red, 2WD, CC, SB, V6, Tow, blk leather, factory spray liner, safety pkg, generic roll up bed cover.