What does Brazil use for automobile fuel?

Basiccaly the same as the other countries.

Brazil uses gasoline, GNV gas, and ethonal made from sugar cane (this kind of fuel, called Etanol, is starting to be exported for other countries, such as the United States, after an agreement made between the Brazilian and American government for the use of this fuel, that is less pollutant than those made with Petrol)

that's why Brazil developed the bi-flex technology for cars, making them able to use gasoline and alcohol in the same car.

Nowadays, there are already tri-flex cars in the streets. They work with three different fuels.