My last tank, which I just finished today, was 40.5 mpg. That was with alot of highway driving at 80 miles per hour, and some bouts of spirited acceleration, but mostly I tried to be gentle. I've measured round trips on the highway as getting around 41 mpg according to the trip meter, including the initial acceleration onto it and deceleration off it, and driving 80 miles per hour once on it without cruise control. That's according to the computer, of course, and the total trip was 20 miles.

I had better results with a Prius, albeit a more broken-in one, and of course a Prius does far better in city driving, regardless of what Honda says... and I wasn't even being gentle with the Prius but I am with my HCH. But I think the HCH is a great car, whereas the Prius would be pretty bad if it weren't for the hybrid drive, IMO.