A dissenting opinion here...
No, 11 mpg is the lowest any of us have every heard of, and I personally think Wormgod has dragging brakes or something else driving it down that low. I also have a supercharged VX and get 14 in the dead of winter, and up around 16-17 in the summer, and I drive really freaking fast. I got maybe a mile or two per gallon better than that before the supercharger install...
Mine is for sale, by the way. There is a thread here on it and it is listed on autotrader.com, among other sites.