Volvo has created a prototype vehicle that runs on 5 different fuels; hythane (10% hydrogen and 90% methane), biomethane, natural gas (CNG), bioethanol E85 (85% bioethanol and 15% petrol) and petrol. Volvo's press release has a great quote from the project leader, Mats Morén:
The idea is to make use of the fuels that are produced locally, says Mats Morén. This means that less fuel needs to be transported between continents, and you can fill up the car on the fuel that is available wherever you are.
Wow, that's a refreshingly good idea. Read on for more info, and links to pictures.