Well, I did as I said. 32 mile round-trip. I started measuring when I left my drive-way until I parked again, including 3 stops at traffic lights, 2 on-ramps/off-ramps, a stop at a gas station for a bottle of water, and a 1 hour stop at the park to hit my work-out. I set CC at 60mph, but the stops and detours dropped my average speed to 47mph. I took the same route home as I did to the park, so hills working for me on the way there, worked against me on the way back, and vis-versa. I also gunned it from one traffic light, which I am sure did not help. The end result was an average of 31.5mpg. It seems that this vehicles is EXTREMELY! sensitive to speed, moreso than any other vehicle I have owned, including my brick of a Grand Jeep Cherokee. Why, I don't know, but thems my results. Can't argue with reality. So from 60 to 70mph, I lose 3.5mpg.
My terrain is NWA, I49, about 20 miles from MO, if you want to Google-earth it. It's gently, long hills, on I49.
ETA: Just spoke to my 2.0XT forester owning friend. driving 80-100 on his last road trip, he was getting 25-26mpg avg. EPA rating for HWY is 28mpg. Just a point of reference.