Well, I ended the first tank at 19mpg, which I am real happy with. I was steady at 20mpg for the first third tank or so, but then did a lot of shuffling materials up/down the street between a neighbor's place and mine, with a bunch of idling. That got us down to about 16.5mpg. A few days of commuting on the highway averaged back up to 19mpg.
So far I have a few gripes:
There is no dead pedal in the driver's footwell, which was annoying for the first few days (my other car is a manual transmission so I am used to having something to do with my left foot, and our other auto transmission cars have all had dead pedals). I sort of took this for granted on Japanese and European cars.
I hate the auto-locking doors (they lock as soon as you go out of park) with a passion, and there is no way to override (for 2013 and below they could reprogram the ECU, but there is no bulletin for the '14 models as of yet). This gets especially annoying when doing short hops on my property to move stuff around, or stopping to let a passenger hop out to open/close a gate. The current solution is to set the option to auto-unlock all doors when going back into park, which helps a little. But not only is that a lot of needless lock/unlock cycles, I am sure there are also going to be situations where I don't want to unlock everything all the time.
This thing is a monster to park. In fact, I will need to make myself a new parking area next to my barn, as parking up by our house is a chore. Years ago I drove a pickup and large chassis-cab flat-bed trucks for construction work, but never really had occasion to park in residential settings or parking lots where everything is scaled to cars.
Thankfully, my gripes are all that minor. Otherwise the truck is great, drives better than I could have hoped, and functions well.
Thus far I have been just throwing stuff in the bed, putting down plywood if it's real rough cargo like cement blocks and pallets. Not sure if I will get some sort of bed mat or liner, or just let it ride as-is. When I worked construction, we never had bed liners, usually just keeping a ratty sheet of plywood in the bed to take hard abuse. Not yet sure how I feel about protecting the bed in a nice truck that I plan to keep for a long time... Be glad to hear suggestions on that front.