There’s an interesting comment in The Guardian, arguing that the world needs to produce more food and not waste it on biofuels.
There is an interesting bit of information in it:
The grain required to fill a [95 litre] tank with ethanol would feed one person for an entire year.
It so clearly demonstrates why biofuels aren’t the answer, as it means driving a car means many people can’t eat – it’s not as if your car could run the whole time on the left-overs from dinner.