Mine said 99.9 when I hit reset while going down the off ramp. Does that count?
My best is 32 MPG hand calculated on a 1100 mile trip from Houston, TX to Moline, IL. I was going 75-77 mph the whole time. I believe I only had to make 4-5 stops (I filled it halfway).
Bone stock. 2.73 rear end.
EDIT: It is an auto.