Elevation also has a seemingly large impact and I've clocked this pretty consistently
Charlottesville (~600 feet elevation) to Richmond (~180 feet elevation): 19 MPG
Richmond to Charlottesville: 17 MPG
Same 65 miles, an almost imperceptible elevation change, 10% drop in fuel efficiency.
2.7, 2 door Basesquatch I am doing very good- 21.6 average after 1100 miles. The average keeps going up. And I took it on it's first highway run this past weekend driving a steady 65 MPH and got about 22 or just over I estimated by the gas I put in. Even though with gas prices as high as they are 21.6 is not very good but to me good for what the vehicle is- and with 35" tires. I am pleased with the MPG, since I was expecting 15-17.
Running 35” Wildpeaks with the 2.7L and my onboard computer which I’m sure is not accurate, is showing 17.8 lifetime. It doesn’t matter as I burn more boat fuel in our 4 month boating season than I will annually driving 40,000 total miles together on our Bronco and Range Rover. FWIW, the Range Rover with 33” tires and the 3.0 Ford diesel powering it gets 29.5 MPG in mixed driving.
I have a Badlands 2.3 sas and im averaging 16.2. A lot of highway miles of speeds between 70 and 80. It really takes a hit at those speeds. I think it gets worse milage in eco mode.
After two tanks of gas and based on the fuel dispenser and odometer:
38.605 Gallons Consumed (Filled up using the same pump, and auto shut-off)
739.5 Miles Driven
MPG= 19.16
Instrument panel MPG shows 20.6
These are combined city/highway miles on concrete streets, flat terrain, near sea level, outside temps at 90 to 100 ºF with the AC set at 69 ºF and conservative driving.
My best guesses (sea level, flat terrain, AC cranking):