Sake, the national drink of Japan, could potentially be used as fuel in vehicles in the near future if a pilot project takes off. At this moment, the town of Shinanomachi has produced a cheap ethanol brew from rice that could see cars in Japan run on biofuels in the not-so-distant future, according to Ubergizmo.
If you're making the sake anyway then there's probably little harm in this. Of course, you have to think about the effect of diverting rice into this area if the idea takes off. You can read more about biofuels at the big biofuels blog.