Yesterday afternoon: Filled up for the first time since leaving the dealership last week. 20.9 gallons, 430 miles for an average economy of just over 20mpg on a brand new truck with not a whole lot of freeway driving. For the size and power this truck has, I'm impressed.
Then, I took it home and washed it, got all the fingerprints off the dash (people love to touch the inside of new cars..), cleaned the new-truck film off the inside of the windows, checked all the fluids again, and set the tire pressure to 35 on all 4 tires. They were inflated too high from the dealer...almost 40psi when cold.