So on Friday, we drove the jeep (2012 Rubi, 2 door) from Portland, OR to Natches, WA. On the way there (fully loaded, windows, top up) I got an average of 17 MPG.
On the way back, the closest fuel station only had premium, so I filled it (from almost 1/4) with premium.
I ended up with a 21 MPG average on the way home.
Only difference (route was the same) was the soft top "freedom panel" was open on the way back
Is this really the result of premium fuel!???