According to this article a few weeks ago in Science Daily, researchers in Italy have figured out how to turn olive pits into fuel:
Olive stones can be turned into bioethanol, a renewable fuel that can be produced from plant matter and used as an alternative to petrol or diesel. This gives the olive processing industry an opportunity to make valuable use of 4 million tonnes of waste in olive stones it generates every year and sets a precedent for the recycling of waste products as fuels.
The difference between fuel from corn and fuel from olive pits? The pits otherwise are waste, while corn grown for fuel displaces crops grown for food.
I think Michael Pollan would approve. What do you think?