I've got 22k on my manual 2018 and my lifetime average fuel economy is 50.7mpg currently.
I've been averaging 60mph on the highway, coasting to stops, and all the other usual hypermiler tricks.
Best highway runs are 65-68mpg. Average is 50-55mpg. I want to crack the 70mpg barrier one day when the warranty is out, by adding panels to the bottom of the car to improve the aero, and also remove the passenger side mirror.
I really like the car, except for the rev hang