Wow. That thing is almost the environmental destroyer that my Scamp is. I hit 14.0 mpg on the Scamp's last tank, and that was one of the better tanks.
Of course, I generally only run it around town. And I waste gas revving at the cops with no cats, resonators or mufflers. They've not pulled me over yet. I think they kind of like the revs I give them. Thinking it's kind of like a salute. I don't rev it so much as just giving it a quick stomp in gear, just to make it loud for an instant. Tis fun!