The past two weeks I got 17.2 MPG in city driving. That's 35 to 50 MPH, never leaving stop lights at more than 2,000 RPM, not speeding, and trying to minimize my exposure to red lights. I was pretty happy with that.
Today I took a 3 hour road trip on the interstate, speeds on the highway were a mix of 65 MPH to 80 MPH on flat roads, no hammering on the gas, just going with the flow. My trip average was 16 MPG. The actual highway portion was down to 15.7, but the side roads once I got off the interstate pushed it back up to 16.
The only way I can get 20 MPG is if I drive a steady, flat, uninterupted 45 MPH, and even then just barely.
So for me, and where I drive, I get 17 city and 15.5 to 16 highway.
I had lots of long flat stretches to look at things and this is what the onboard computer tells me I'm getting at these speeds:
65 MPH - 18 MPG
70 MPH - 16 MPG (just under 2,000 RPM at that speed)
75 MPH - 15 MPG
80 MPH - 13 MPG
I've got 5,500 miles on it. Maybe it'll get a bit better? Dunno. Those highway figures are about the same as my 2010 F150 Lariat Crew Cab, 4x4 with the 5.4 liter V8. I'm going to guess that's just the way it is trying to push something shaped like a dumpster through the wind at those speeds.
All figures were generated with non-ethanol gas.
2021 Rebel, crew cab, 5.7 etorque, 3.92 gears.