The cars run on alcohol.
In brazil most cars have two gas tanks.One small one for petrol to get the car started and a big one for alcohol.Alcohol is both a lot cheaper and less polluting than petrol so i think it´s a very cool thing that you can buy alcohol at the gas stations.It all started with the oil crisis in the 1970´s where Brazil decided that there was no reason to be so depending on foreign oil when cars can easily run on methanol prodused from sugar cane, which they have plenty of inn Brazil.One other very nice side effect this has is that the smog situation in Brazil is not nearly as bad as you would think of a country with so many mega cities.
