Here's some data from a 2wd FEH.
I have 44 psi in all tires, and roof-rack cross bars removed.
Also, 0W-20 Mobil 1 oil.

The "best" is easy to remember.

48 MPG at 48 miles per hour.

42 MPG at 55 miles per hour
40 MPG at 60 miles per hour
37 MPG at 65 miles per hour
33 MPG at 70 miles per hour
29 MPG at 75 miles per hour
26 MPG at 80 miles per hour

The best is city, where I use "Pulse & Glide" and "Low Gear Advantage.
In the city, even with A/C use, I get 44-48 MPG at 30-40 miles per hour.

Without A/C in city driving, I can get 54 MPG without much effort.
68 MPG is possible if I pull out all the stops and really try hard.