My 22 with Sync 4 has a physical screen-off button under the screen between the volume and tuning knobs. I don't use it much, but it is nice to have if the screen gets to be distracting.
I have the 7.3l gas engine. Right now, I mainly spend time 50/50 on highways and in-town with idle time in drive-through restaurants and stop lights. Cheyenne is about 6000 ft in altitude and I'm getting 12.1-ish mpg. I had no problem cooking a bunch of cars off the line at a stop light...
I had a Lear shell on my 2010 for a while and then an Undercover Flex. I've come to prefer the lower profile look of a tonneau cover. Then, after watching LLOD on YouTube, I've come to like the look of the Diamondback. Thanks for sharing your experience.