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I only have 700 miles on my 2018 I can average 10 mpg on a 120 mile trip to sac with some in town driving.
Towing a 5k lb trailer it does it well but it’s in the 10mpg range at 70-75.
Comparing to the 95k I put on a 2013 raptor where it got 10.4 no matter what I did with a Hennessey Performance tune.
IMO mpg is up a little but nowhere near excellent. The above was all in CA 91 octane.
You'll pick up 5MPG without the trailer.