I just got back from a trip up north. (about 200 miles each way, plus about 100 miles from driving while up there.)

I was delighted when I got back home and filled the tank. The display (and my calculated MPG was 40.5mpg. It was about 1/2 freeway driving (65mph) over flat interstate. The other half was country road/highway (45 or 55mph... very flat, with a few towns where it went down to 35mph---which was mainly in electric-only mode) While we were up there it was hilly, but the hills were very gradual (both up and down).

I can't believe that I didn't have to fill up at all while on vacation. That's awesome! Nearly 600 miles on a single tank.