The prior two posts neglect the higher used value of vehicle with more equipment, especially the diesels. For the first 10 years or so, diesel powered HD trucks retain at least 50% of that new up front cost. We don't know what the used values will be for the GM twins baby duramax, but I expect similar 50%-ish over the next 10 years.
Anyone getting 22mpg with the 3.6L would likely get over 30mpg in a diesel. I've never gotten more than 16mpg in the crossovers and 19mpg in cars equipped with that engine. The 3.6L driving experience has never impressed me either.
