Further to my above post...
I have a ~5 mile stretch of road from the gas station I normally use to my home. There are are a couple of stop lights and intersections, and a bit of up and down (but relatively flat). Average speed while driving is ~35 MPH.
Since I clear the trip computer at the time of fill-up, I always like to see just how high I can get the digital average MPG read out to be by the time I get home.
My record... 44.3 MPG!